1. The molecular formula of the compound is C₆H₃₆O₁₂
2. The molecular formula of the compound is N₂H₄O₂
3 The empirical formula and molecular formula of the compound are: C₂H₃ and C₄H₆
4. The empirical formula of the compound is C₃H₆O
5. The empirical formula of the compound is ZrSiO₄
1. How to determine the molecular formula Empirical formula = CH₆O₂Molar mass = (285 + 315) / 2 = 600 / 2 = 300 g/moleMolecular formula =?Molecular formula = empirical × n = molar mass
[CH₆O₂]ₙ = 300
[12 + (6×1) + (16×2)]ₙ = 300
50n = 300
Divide both side by 74
n = 300 / 50
n = 6
Molecular formula = [CH₆O₂]ₙ
Molecular formula = [CH₆O₂]₆
Molecular formula = C₆H₃₆O₁₂
2. How to determine the molecular formula Empirical formula = NH₂OMolar mass = (55 + 65) / 2 = 120 / 2 = 60 g/moleMolecular formula =?Molecular formula = empirical × n = molar mass
[NH₂O]ₙ = 60
[14 + (2×1) + 16]ₙ = 60
32n = 60
Divide both side by 32
n = 60 / 32
n = 2
Molecular formula = [NH₂O]ₙ
Molecular formula = [NH₂O]₂
Molecular formula = N₂H₄O₂
3. How to determine the empirical formula and molecular formulaWe'll begin by obtaining the empirical formula. This is illustrated below:
Carbon (C) = 88.9%Hydrogen (H) = 11.1%Empirical formula =?Divide by their molar mass
C = 88.9 / 12 = 7.4
H = 11.1 / 1 = 11.1
Divide by the smallest
C = 7.4 / 7.4 = 1
H = 11.1 / 7.4 = 3/2
Multiply by 2 to express in whole number
C = 1 × 2 = 2
H = 3/2 × 2 = 3
Thus, the empirical formula of the compound is C₂H₃
Finally, we shall determine the molecular formula of the compound. This is illustrated below:
Molar mass of compound = 54 g/molEmpirical formula = C₂H₃Molecular formula =?Molecular formula = empirical × n = molar mass
[C₂H₃]ₙ = 75.16
[(12×2) + (3×1)]ₙ = 54
27n = 54
Divide both side by 27
n = 54 / 27
n = 2
Molecular formula = [C₂H₃]ₙ
Molecular formula = [C₂H₃]₂
Molecular formula = C₄H₆
4. How to determine the empirical formulaCarbon (C) = 62.07%Hydrogen (H) = 10.34%Oxygen (O) = 27.59%Empirical formula =?Divide by their molar mass
C = 62.07 / 12 = 5.1725
H = 10.34 / 1 = 10.34
O = 27.59 / 16 = 1.724
Divide by the smallest
C = 5.1725 / 1.724 = 3
H = 10.34 / 1.724 = 6
O = 1.724 / 1.724 = 1
Thus, the empirical formula of the compound is C₃H₆O
5. How to determine the empirical formulaZr = 49.76%Si = 15.32%O = 34.91%Empirical formula =?Divide by their molar mass
Zr = 49.76 / 91 = 0.547
Si = 15.32 / 28 = 0.547
O = 34.91 / 16 = 2.182
Divide by the smallest
Zr = 0.547 / 0.547 = 1
Si = 0.547 / 0.547 = 1
O = 2.182 / 0.547 = 4
Thus, the empirical formula of the compound is ZrSiO₄
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A piston-cylinder device contains helium gas, during a reversible, isothermal process the entropy of the helium will __________ increase.
A piston-cylinder device contains helium gas, during a reversible, isothermal process the entropy of the helium will sometimes increase.
As entropy of an ideal gas depends on pressure and temperature . Hence , entropy change during isothermal process if pressure changes . Enropy changes whenever there is a transfer of heat . The change in entropy is the heat added divided by the temperature at which the transfer took place .
A piston-cylinder is a moving device that is made tight by the piston rings. It moves inside in a cylinder in the form of liquid and later expands and then contracts.
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A 1. 7 m solution of the acid ha has a ph of 1. 0. what is the ka of the acid? the equation described by the ka value is ha(aq) h2o(l)⇌a−(aq) h3o (aq)
A 1. 7 m solution of the acid ha has a ph of 1. 0, then the ka of the acid is 6.25×10^(-3).
What is acid dissociation constant?The acid dissociation constant is defined as the value which is used to measure the strength of the specific acid in the solution.
Equation for general dissociation of strong or weak acid is
HA ----- (H+) + ( A-)
Ka can be expressed as
Ka = [H+] [A-]/[HA]
where [H+] is the concentration of H+ ions
Now, we will find the value of concentration of H+ ions
pH = -log [H+]
1 = -log[H+]
[H+] = antilog(-1)
[H+] = 0.1
By using ICE table, we find that the concentration of [HA] is
1.7-0.1
= 1.6
By substituting all the values we get,
Ka = 0.1 × 0.1/1.6
= 6.25×10^(-3)
Thus, we find that the Ka value of the given solution is 6.25×10^(-3).
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how many grams of nacl ( 58.44 g/mol) are needed to make 250.0 ml of a 1.50 m solution of nacl?
Answer:
21.92 gm
Explanation:
A 1.5 M solution would have 1.5 * 58.44 = 87.66 gm per liter
you only need 1/4 of this (250 ml) = 21.92 gm
Write the empirical formula for at least four ionic compounds that could be formed from the following ions:
Answer:
Fe(C₂H₃O₂)₃, Fe(CN)₃, Pb(C₂H₃O₂)₄, Pb(CN)₄
Explanation:
Cations (positively charged ions) can only form ionic bonds with anions (negatively charged ions). However, you can't just simply put one cation and one anion together to form a compound. Each compound needs to been neutral, or have an overall charge of 0. When cations and anions do not have charges that perfectly cancel, you need to modify the amount of each ion in the compound.
1.) Fe(C₂H₃O₂)₃
-----> Fe³⁺ and C₂H₃O₂⁻
-----> +3 + (-1) + (-1) + (-1) = 0
2.) Fe(CN)₃
-----> Fe³⁺ and CN⁻
-----> +3 + (-1) + (-1) + (-1) = 0
3.) Pb(C₂H₃O₂)₄
-----> Pb⁴⁺ and C₂H₃O₂⁻
-----> +4 + (-1) + (-1) + (-1) + (-1) = 0
4.) Pb(CN)₄
-----> Pb⁴⁺ and CN⁻
-----> +4 + (-1) + (-1) + (-1) + (-1) = 0
Determine the [oh−] , ph, and poh of a solution with a [h ] of 7. 2×10−8 m at 25 °c
The pH= 7.57 , pOH = 6.86, and [OH-] = 1.58 x 10⁻⁴ M M of the given solution.
What is pH?pH is a scale that measures the acidity and basicity of a solution. Its ranges from 1 to 14. Seven is neutral.
The H given is 7. 2 × 10⁻⁸ m
Calculating the pOH
[H⁺] = 10^(-7.20)
[H⁺] = 6.31 x 10⁻⁹ M
pOH = 14 - 7.2
pOH = 6.8
Calculating the [oh−]
[OH⁻] = 1 x 10⁻¹⁴ / 6.31 x 10⁻⁹
[OH⁻] = 1.58 x 10⁻⁴ M
Calculating the pH
pH = 14 - 6.43
pH = 7.57
Thus, the pH= 7.57 , pOH = 6.86, and [OH-] = 1.58 x 10⁻⁴ M.
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When hydrochloric acid reacts with magnesium metal, hydro- gen gas and aqueous magnesium chloride are produced. what volume of 5.0 m hcl is required to react completely with 3.00 g of magnesium?
The volume of 5.0 m hcl is required to react completely with 3.00 g of magnesium is 20 L.
Chemical equation:Mg + 2HCl -----MgCl2 + H2
Given,
Molar mass of Mg = 24g/mol
Mole = Given mass/ Molar mass
Mole= 3/24
= 0.125 mol
From the given equation we get to know that
Mol ratio of Mg and HCl is 1:2.
Therefore,
mol of HCl = (2/1) × mol of Mg
=2× 0.125
= 0.25
Molarity = m× V
= M/m
= 5/0.25
= 20L
Thus, we find that the volume of 5.0 m hcl is required to react completely with 3.00 g of magnesium is 20 L.
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Explain why when an ion is formed, the mass of the atom does not change.
Answer:
Atoms are made up of protons, neutrons, and electrons. The mass of an atom is determined by the total number of neutrons and protons in the nucleus. The difference between an atom and an ion is the number of electrons. The change of electrons does not change the mass because electrons have a negligible mass. In other words, the mass of electrons is so small, it is considered insignificant.
How many grams of agcl would be needed to make a 4. 0 m solution with a volume of 0. 75 l?
430 g of AgCl would be needed to make a 4.0m solution with a volume of 0.75 L.
What is Molarity?The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per liter of a solution is known as molarity.Calculation of Required amount of AgClRemember that mol/L is the unit of molarity (M).
We can compute the necessary number of moles of solute by multiplying the concentration by the liters of solution, according to dimensional analysis.
0.75L×4.0M=3.0mol
Then, using the periodic table's molar mass for AgCl, convert from moles to grams:
3.0mol×143.321gmol=429.963g
The final step is to round to the correct significant figure, which in this case is two: 430g.
Hence, 430 g of AgCl would be needed to make a 4.0m solution with a volume of 0.75 L.
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When the reactants have less enthalpy than the products, then __________. A. heat energy is given out B. None of these C. heat energy is absorbed D. the reaction will be complete
When the reactants have less enthalpy than the products, then heat energy is given out. That is option A.
What is exothermic reaction?An exothermic reaction is a type of reaction in which the energy level of the reactants are higher than that of the product.
It is this discrepancy in the energy levels of both the reactants and products would lead to the generation and release of energy into the surrounding environment.
The enthalpy of exothermic reaction is gotten by the difference between the energy needed to break the bonds of reactants and the energy needed for the formation of products.
Therefore,when the reactants have less enthalpy than the products, then heat energy is given out.
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Consider the reaction below.
H O single bonded to C double bonded above to O and to the right to the bottom left of a benzene ring. The ring is bonded from the upper right to a C double bonded above to O and to the right to O H. H O bonded to C H Subscript 2 Baseline C H Subscript 2 Baseline bonded to O H. Arrow pointing with bond H Subscript 2 Baseline O beside it pointing down to H O bonded to C double bonded above to O and to the right to the bottom left of a benzene ring. The ring is bonded from the upper right to a C double bonded above to O and to the right to O bonded to C H Subscript 2 Baseline C H Subscript 2 Baseline bonded to O H.
This reaction eventually forms this product.
A bond from left to O single bonded to C double bonded above to O and to the right to the bottom left of a benzene ring. The ring is bonded from the upper right to a C double bonded above to O and to the right to O bonded to C H Subscript 2 Baseline C H Subscript 2 Baseline bonded to O bonded to C double bonded above to O and right to the upper left corner of a benzene ring. The ring is bonded from the lower left to C double bonded above to O and single bonded right to O bonded to CH Subscript 2 Baseline C H Subscript 2 Baseline bonded right to O bonded to C double bonded above to O and right to the lower left of a benzene ring, which is bonded from upper right to C double bonded above to O and single bonded right to O bonded to C H Subscript 2 Baseline C H Subscript 2 Baseline bonded to O.
Which type of reaction is represented by these diagrams?
elimination
substitution
addition polymerization
condensation polymerization
The type of reaction that is represented by these diagrams (attached) are given as: "condensation polymerization" (Option D)
What is condensation polymerization?Any type of polymer in polymer science that undergoes a condensation reaction during the polymerization process is referred to as a condensation polymer (i.e. a little molecules, methanol or water is derived as a metabolite).
The provided reaction is an example of condensation polymerization because it involves the combination of two monomers, which produces a big polymer and water as a byproduct.
Condensation polymers make significant contributions to the packaging, insulation, and textile sectors as far as real-world application of same is concerned.
Also examples of times that are condensation polymers and that have silicon rather than carbon as part of their molecular or structural make up are;
Silicone Oils and Rubbers.In conclusion, it is to be noted that The type of reaction that is represented by these diagrams (attached) are given as: "condensation polymerization"
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Answer:
condensation polymerization
Explanation:
What is the kinetic product obtained from the addition of 1 mole of bromine to 1,3-butadiene?
From the addition of 1 equivalent of HBr to 1,3-butadiene, 3-bromo-1-butene is obtained as a product.
What is moles?
Moles are defined as the smallest base unit that is equivalent to [tex]6.02214 X 10^{23}[/tex] units.
Moles are chemical entities, which are used to measure the mass or molecular mass of the compound, molecule, or atom. The moles are, for example can be explained as equal to the mass of the atom. For example, there is one mole in 12 grams of carboncarbon.
Thus the kinetic product formed is 3-bromo-1-butene.
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The sp of pbbr2 is 6. 60×10−6. what is the molar solubility of pbbr2 in pure water?
Ksp of PbBr₂ is 6.60 × 10⁻⁶. The molar solubility of PbBr₂ in pure water is 0.0118M.
Ksp or Solubility Product Constant is an equilibrium constant for the dissociation in an aqueous solution.
Molar solubility (S) is the concentration of the dissolved substance in a solution that is saturated.
Let the molar solubility be S upon dissociation.
PbBr₂ or Lead Bromide dissociates in pure water as follows:
PbBr₂ ----------> Pb⁺² + Br⁻
S 2S
Ksp = [Pb⁺²] [ Br⁻]
Ksp = (S) (2S)²
Ksp = 4S³
6.60 × 10⁻⁶ = 4S³
S = 0.0118M
Hence, the Molar solubility S is 0.0118M.
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How are air temperature and humidity related? 1 colder air can hold more water vapor than warmer air. 2 warmer air and colder air can hold the same amount of water vapor. 3 warmer air can move faster than colder air. 4 warmer air can hold more water vapor than colder air.
Warmer air can hold more water vapor than colder air.
Weather is the atmospheric conditions of a specific area over a short period of time.Precipitation, wind, temperature, atmospheric pressure, relative humidity, cloud, and wind speed are all weather elements.Temperature is a measurement of the degree of coldness or hotness of a physical object (body).Humidity, on the other hand, refers to the concentration (amount) of water vapor in the air. It is high when there is a lot of water vapor in the air and low when there is little water vapor.How can humidity levels affect your home's temperature?Your home's windows are fogged with condensation. A musty odor can be detected in the air inside your home. When you breathe in, you can feel the moisture in the air. These indicators indicate that you should act quickly. Moisture levels in your home raise the overall temperature and make it feel hot.
What is Absolute Humidity & Relative Humidity?Humidity is classified into two types: absolute and relative.
The former describes the humidity present in a parcel of air without taking temperature into account, whereas the latter describes the humidity present in the air while taking temperature into account. The former defines the amount of water content by dividing the parcel's weight by its volume, whereas the latter is calculated by dividing the amount of water content present by the total capacity of the parcel of air to hold multiplied by 100. The former decreases with height, whereas the latter becomes saturated when it reaches 100%.
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What is one of the most common uses of polyvinyl chloride? select one: a. 2-l soda bottles b. styrofoam cups c. plastic pipes d. plastic food bags e. plastic garbage cans
The correct answer choice which is the most common use of polyvinyl chloride is: plastic pipes. Option C
Below are some other uses of polyvinyl chloride:
It's pipes is used for fittingsIt's pipes is used for building infrastructure and structural materialIt is used for coatingsWhat is polyvinyl chloride?Polyvinyl Chloride (PVC) is polymer which is used in various applications including widespread use in building, transport, packaging, electrical and healthcare applications.
So therefore, the most common use of polyvinyl chloride is in the making of plastic pipes
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How many molecules are in 1.75 mol of CHCl3
Answer:
1.0535×10(exponent24)
Explanation:
N (number of molecules)
n(number of moles)
L( Avogadro's constant )
N=n×L
N=1.75×6.02×10(exponent 23)
Explanation:
In one mole we always have:
1 mol = 6.02 X 10²³ molecules
So emulates simple rule of 3 we will have;
1 mol ----------> 6.02 X 10²³
1.75 moles ----> X
X = 1.0535 X 10²⁴ molecules
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The heat of fusion (δhfus) of benzene (c6h6) is 10. 0kjmol while its heat of vaporization (δhvap) is 34. 1kjmol. estimate the enthalpy of sublimation (δhsub) of benzene.
The heat of fusion (δhfus) of benzene (c6h6) is 10. 0kjmol while its heat of vaporization (δhvap) is 34. 1kjmol then enthalpy of sublimation (δhsub) of benzene is 44.1 kJ mol.
The heat of fusion is amount of heat involved during conversion of solid into liquid.
Solid → liquid
The heat of vaporization is amount of heat involved during conversion of liquid into vapor.
liquid → vapor
The enthalpy of sublimation is amount of energy involved during conversion of solid into vapor.
Solid → vapor
The enthalpy of sublimation is equal to sum of heat of fusion and heat of vaporization .
Mathematically, heat of sublimation = heat of fusion + heat of vaporization .
heat of sublimation = 10. 0 kJmol + 34. 1 kJmol. = 44.1 kJ mol
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2CO(g) + O2(g) = 2CO2(g)
If 6.0 L of CO reacts at STP, how many liters of oxygen are required for the reaction?
Answer:
3.0 L O₂
Explanation:
If CO reacts at STP, it means that there are 1.0 moles of CO. To find the moles of O₂, you need to use the mole-to-mole ratio from the given equation.
1.0 moles CO 1 mole O₂
---------------------- x --------------------- = 0.5 moles O₂
2 moles CO
To calculate the liters of oxygen, you need to use Avogadro's Law:
V₁ / N₁ = V₂ / N₂
In this equation, "V₁" and "N₁" represent the volume and moles of the first molecule. "V₂" and "N₂" represent the volume and moles of the second molecule. You can plug the given and calculated values into the equation and simplify to isolate V₂.
V₁ = 6.0 L V₂ = ? L
N₁ = 1.0 moles N₂ = 0.5 moles
V₁ / N₁ = V₂ / N₂ <----- Avogadro's Law
(6.0 L) / (1.0 moles) = V₂ / (0.5 moles) <----- Insert values
6.0 = V₂ / (0.5 moles) <----- Simplify left side
3.0 = V₂ <----- Multiply both sides by 0.5
**I am not 100% confident on this answer. Please let me know if it is incorrect**
Answer:
2CO(g) + O2(g) → 2CO2(g)
If 9.0 L of O2 react at STP, how
many moles of CO2 form during the
reaction?
[?] mol CO2
Explanation:
What would it be if it was 9.0?
What is the molality of a solution prepared by dissolving 3. 41 g of c6h12o6 in 85 ml of water:__________
When 3. 41 g of C6H12O6 is dissolved in 85 ml of water the molality is 2.2m.
What is molality?Molality is the amount of a substance dissolved in a certain mass of solvent.
Molality = moles of solute/ mass of solvent (kg)
Given,
Mass of solute = 3.14g
Molar mass of solute = 180 g
Mole of solute= given mass/molar mass
= 3.14/180
= 0.0189 mol.
Volume of solvent = 85 ml
Density of water = 1 g/cm3
Density = mass/ volume
mass = density × volume
= 1× 85
= 85g
Molality = (0.0189/ 85) × 1000
= 2.2m
Thus we find that the molality of given solution is 2.2m.
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A 400. 0 g sample of liquid water is at 30. 0 ºc. how many joules of energy are required to raise the temperature of the water to 45. 0 ºc?
Energy required to raise the temperature from 35°C - 45 °C= 25116 J.
specific heat, the quantity of warmth required to raise the temperature of one gram of a substance by means of one Celsius degree. The units of precise warmth are generally energy or joules consistent with gram according to Celsius diploma. for instance, the unique warmth of water is 1 calorie (or 4.186 joules) according to gram in step with Celsius degree.
solving,
Sample of liquid = 400. 0 g
temperature = 30. 0 ºc
joules of energy are required to raise the temperature of the water to 45. 0 ºc
therefore rise in temperature 45 - 30 = 15°C
Specific heat capacity = 4.186 J/g m °C
In kelvin = 273 + 15 = 288
= ∴ energy required = Q = m s ( t final - t initial)
= 400*4.186 * 15
= 25116 joule
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The Enthalpy profile of chemical reaction is shown at the river. On the graph, indicate the magnitude of:
Energy was given out in the process as such the reaction must be exothermic given the loss of energy.
What is a reaction profile?The reaction profile shows the the interaction between substances. Now the vertical axes shows the energy while the horizontal axes shows the course of the reaction. The hump at the top of the profile shows the activation energy. The activation energy is the maximum energy that is required for reactants to cross the barrier and become products.
Now we know that the endothermic reaction is one in which energy is taken in while an exothermic reaction is one in which energy is given out.
As such we can see from the graph that the energy of the reactants is greater than that of the products. This implies that energy was given out in the process as such the reaction must be exothermic given the loss of energy.
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What concentration of the barium ion, ba2 , must be exceeded to precipitate baf2 from a solution that is 1. 00×10−2 m in the fluoride ion, f−? ksp for barium fluoride is 2. 45×10−5
The amount of barium ions that must be present in order for the salt to precipitate is 0.245 M.
A solution's solubility product is the result of raising each ion's concentration to the power of its stoichiometric ratio. It is portrayed as
A combination of 1 barium ion and 2 fluoride ions results in the ionic compound known as barium fluoride.
The following equation describes the equilibrium reaction for barium fluoride ionization:
BaF₂ → Ba²⁺ + 2F⁻
Ksp = [Ba²⁺] · [F⁻]²
2.45*[tex]10^{-5}[/tex]= [Ba²⁺] * [tex][1. 00*10^{-2} ]^{2}[/tex]
[Ba²⁺]=0.245 M
As a result, 0.245 M of barium ions must be present in order for the salt to precipitate.
SolubilitySolubility in chemistry refers to a chemical's capacity to dissolve in another substance, the solvent, to produce a solution. Inability of the solute to create such a solution is the opposite quality, or insolubility. A substance's degree of solubility in a given solvent is often determined by the amount of the solute present in a saturated solution, which is a solution in which no additional solute can be dissolved. The solubility equilibrium between the two compounds is considered to have been reached at this time. If there is no such restriction for a given solute and solvent, the two are referred to as being "miscible in any amounts."
What concentration of the barium ion, ba2 , must be exceeded to precipitate baf2 from a solution that is 1. 00×10−2 m in the fluoride ion, f−? ksp for barium fluoride is 2. 45×10−5
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What are the differences between grasses and legumes? advantages and disadvantages of each
The differences between grasses and legumes are,
The grasses tend to have more digestible fiber than legume plants.Legumes have more protein , energy and micronutrient due to their abundant leaves as compare to grasses.The nutrient composition is an obvious and major difference between the two plants.The advantage and disadvantage of grasses are given below.
Advantage:
Grasses helps to keep air clean, trap carbon dioxide , reduce erosion from storm water runoff , improve soil , decreases noise pollution and reduce temperature.
Disadvantage:
It is necessary to cut grasses regularly.Sometime grasses harmful to the environment . Likewise rainwater runoff from lawns can carry pesticides and fertilizer into river , lake ,streams and ocean via the sewer system.The advantage and disadvantage of legumes are given below.
Advantage:
The legumes supply nutrients essential to our body which supports our health.Disadvantage:
It lower persistence than grass under grazing It has high risk of livestock bloat It is difficult to conserve as silage or hay.learn about legumes
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Which substance is a product of glycolysis, a precursor of gluconeogenesis and a precursor of the citric acid cycle?
Pyruvate substance is a product of glycolysis, a precursor of gluconeogenesis and a precursor of the citric acid cycle
A crucial node in the network of metabolic pathways is pyruvate. Pyruvate can be transformed into ethanol, the amino acid alanine, fatty acids or energy through acetyl-CoA, carbohydrates through gluconeogenesis, and fatty acids or energy. As a result, it combines numerous important metabolic activities.
Pyruvate's main job is to carry carbon atoms into the mitochondrion where they are fully oxidized into carbon dioxide.
The final byproduct of glycolysis, pyruvate, is crucial to cell metabolism. It is made in the cytosol and then oxidized in the mitochondria, where it activates oxidative phosphorylation and feeds the citric acid cycle.
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How many different products can be formed from a poorly planned crossed aldol addition?
a. 1
b. 2
c. 3
d. 4
e. 5
There are 4 different products will be formed from a poorly planned crossed aldol addition.
In a crossed aldol condensation, two distinct ketone and aldehyde reactants are used. Due to the possibility of several enolate nucleophiles as well as multiple carbonyl electrophiles, similar reactions typically result in a variety of distinct condensation products.
Ethanol and propanol undergo cross-aldol condensation, which results in two products:
one where ethanol serves as an enolate ion and the other where propanol serves as an enolate ion. 2-Methylbut-2-enal and Pent-2-enal are just the two cross-aldol derivatives.Therefore, the correct answer will be option (d)
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There are four different products can be formed from a poorly planned crossed aldol addition.
So the correct option is D
Two distinct ketone and aldehyde reactants are used in a crossed condensation reaction. Due to presence of distinct ketone and aldehyde reactants there are possibility of formation of several enolate ion nucleophiles as well as multiple carbonyl electrophile .
Example : Ethanal and propanone undergoes cross-aldol condensation reaction and give results in two products.
First case: ethanal acts as enolate ion
Second case: propanone acts as enolate ion
Third case: when self condensation is also a product.
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Consider the reaction shown.
4 HCl(g) + O₂(g) → 2Cl₂(g) + 2 H₂O(g)
Calculate the number of grams of Cl2, formed when 0.125 mol HCl reacts with an excess of 0₂.
mass:
Answer:
4.43 g Cl₂
Explanation:
To find the mass of Cl₂, you need to (1) convert moles HCl to moles Cl₂ (via the mole-to-mole ratio from equation coefficients) and then (2) convert moles Cl₂ to grams (via the molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units. The final answer should have 3 significant figures like the given value.
4 HCl(g) + O₂(g) -----> 2 Cl₂(g) + 2 H₂O(g)
^ ^
Molar Mass (Cl₂): 2(35.453 g/mol)
Molar Mass (Cl₂): 70.906 g/mol
0.125 moles HCl 2 moles Cl₂ 70.906 g
-------------------------- x ---------------------- x ------------------- = 4.43 g Cl₂
4 moles HCl 1 mole
Calculate the ph of a solution formed by mixing 250. 0 ml of 0. 15 m nh4cl with 200. 0 ml of 0. 12 m nh3. the kb for nh3 is 1. 8 × 10-5.
i. 9. 45
ii. 4. 74
iii. 9. 06
iv. 04. 55
v. 9. 26
The potential of the hydrogen in water gives the pH of the acidity and basicity of the solution. The pH of the solution is 9.06. Thus, option iii is correct.
What is pH?The pH of a substance is given by the subtraction of the pOH from 14 which is the range of the pH scale.
The dissociation reaction for ammonia is given as,
NH₃ (aq) + H₂O (l) ⇄ NH₄⁺ (aq) + OH⁻ (aq)
Here, the concentration of ammonia is [NH₃] - x, ammonium ion is [NH₄⁺] + x, and hydroxide ion is x.
The molar concentration of ammonia is,
M = (0.12 M × 0.2 L) ÷ 0.45 L = 0.053 M
The molar concentration of ammonium ion is,
M = (0.15 M × 0.25 L) ÷ 0.45 L = 0.083 M
From the base dissociation constant and previous concentration from the reaction, the value of x or hydroxide ion is calculated as,
Kb = [NH₄⁺][OH⁻] ÷ [NH₃]
1.8 × 10⁻⁵ (0.053 - x) - (0.083 + x) × x = 0
x = [OH⁻] = 1.15 x 10⁻⁵
The pH from the hydroxide ion is calculated as,
pOH = - log [OH⁻]
= - log (1.15 x 10⁻⁵)
= 4.94
Further,
pH = 14 - pOH
= 14 - 4.94
= 9.06
Therefore, option iii. 9.06 is the pH of the solution.
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A mixture of 10. 0 g of Ne and 10. 0 g ar have a total pressure of 1. 6 atm. What is the partial pressure of Ne?
Answer:
1.1 atm
Explanation:
moles of neon = 10.0g /20.2g/mole =.495 mole
moles of ar = 10.0 g /39.9 g/mole= .251 mole
the partial pressure of each is determined by their mole fractions of the entire mix
Ne .495 mole / (.495 + .251 mole) * 1.6 atm =
1.1 atm ( to two significant figures)
How many milliliters of an aqueous solution of 0. 195 m sodium sulfate is needed to obtain 4. 27 grams of the salt?
The volume of the aqueous solution of sodium sulfate required is 153.85 mL.
Number of moles of the saltThe number of moles of the salt in the given mass is calculated as follows;
moles = reacting mass / molar mass
molar mass of sodium sulfate = 142 g/mole
moles = (4.27) / (142)
moles = 0.03 mole
Volume of the aqueous solution of sodium sulfateConcentration = moles/volume in liters
0.195 = 0.03/V
V = 0.03/0.195
V = 0.15385 liters
V = 153.85 mL
Thus, the volume of the aqueous solution of sodium sulfate required is 153.85 mL.
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Which of the following statements statements expresses the following chemical equation with words?
2 K(s) + Cl₂(g) →> 2 KCI(S)
->
Select one:
O a. Four atoms of krypton react with two molecules of Cl₂
O b. Two atoms of potassium react with one molecule of chlorine to produce two molecules of potassium chloride.
O c. One atom of chromium reacts with 1 molecule of calcium to produce 1 molecule of chromium calcide.
O d. Two atoms of potassium react with potassium chloride to produce chlorine gas.
Answer:
option b is the answer of given statementtwo atoms of potassium react with one molecule of chlorine to produce two molecules of potassium chloride
Please Help!
9/4Be + 4/2He = 12/6c + ?
a. 1/0n
b. 0/1e
c. 0/1H
d. 2/1H
Answer:
(1/0)n
See attached explanation.