[tex]NO_{2}[/tex](g) + OH(g) = [tex]HNO_{3}[/tex] (aq) (nitric acid)
Given,
Pressure of [tex]NO_{2}[/tex] = 4.5x10-8 atm,
volume = 1.3x109 L, and
temp = 10ºC + 273 = 283K
moles. NO2 =? = n
PV = nRT
n = PV/RT = (4.5x10-8 atm)(1.3x109 L) / (0.0821 Latm/Kmol) (210K)
n = 3.4x10-18 moles NO2 = mols HNO3
mass HNO3 = 3.4 x 10 18 moles x 31 g/mol = 1.05 x 10 16 g.
Nitric acidThe inorganic substance nitric acid has the formula HNO3. This mineral acid is extremely corrosive. [5] Even though the chemical is colorless, older samples often have a yellow tinge from breakdown into nitrogen oxides. Nitric acid is 68 percent concentrated in water in the majority of commercially available products. Fumigating nitric acid is the term used to describe a solution that contains more than 86 percent HNO3. Depending on the quantity of nitrogen dioxide, fuming nitric acid is further classified as red fuming nitric acid at concentrations above 86 percent or white fuming nitric acid at concentrations above 95 percent. The main chemical used in nitration, or adding a nitro group usually to an organic molecule, is nitric acid.
How many grams of nitric acid are produced from this reaction if it reduces the partial pressure of no2 from a 1. 3×109l volume of air over a city by 4. 5×10−8atm when the temperature is 10∘c?
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You are asked to weigh approximately 0. 4g of acetylsalicylic acid to the nearest mg. When you enter the data in grams in your lab notebook, how many significant figures will you record ?.
Number of significant figures will be 1
Given:
weight of acetylsalicylic acid = 0. 4g
To Find:
significant figures
Solution: Significant figures are the digits of value which carry meaning towards the resolution of the measurement. They are also called significant figures in chemistry. All the experimental measurements have some kind of uncertainty associated with them.
When we convert 0.4g acetylsalicylic acid to mg we get value 400mg
when we convert 400mg to gram we get value of 0.4 gram
Since 0 before a decimal is not significant so there is only one significant figure that is 4
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What volume of benzaldehyde (ml) is 3 .00 mmol? the density of benzaldehyde is 1.045 g/ml.
The volume of benzaldehyde (ml) is 304.65 mL, if the density of benzaldehyde is 1.045 g/ml and having 3 mol.
Given,
Moles of benzaldehyde = 3 mol
Density of benzaldehyde = 1.045g/mol
Molar mass of benzaldehyde = 106.12 g/mol.
As we know that,
Moles can be calculated as
Moles = Given mass/ molar mass
3 = Given mass/ 106.12
Given mass = 318.36g.
The mass of benzaldehyde is 318.36g.
Now,
Density = mass/ Volume
1.045 = 318.16/ Volume
Volume = 318.36/1.045
Volume = 304.65 mL.
Thus, we find that the volume of benzaldehyde is
304.65 mL.
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Q4. When 20 g of salt is added to a beaker containing 100 g of water, the salt dissolves and seems to disappear as a solution is formed. A) What is the mass now? B) Explain your answer.
The mass of the solution is equal to 120 g. As the salt dissolves in water so it disappears when the solution is formed.
Why does salt dissolve in water?The salt dissolves in water at the molecular level, due to electrical charges. Due to this fact that both water and salt are polar, with positive and negative charges on opposite sides of their molecule. The bonds in salt are ionic and have an electrical charge.
Likewise, a water molecule is also ionic in nature, but the covalent bonds are present with two hydrogen atoms and one oxygen atom, which has a negative charge. The salt dissolves because the covalent bonds of water molecules are stronger than the ionic bonds present in the salt molecules.
The mass of the given salt is equal to 20 g while the mass of water is 100g. The total mass of the solution is equal to the sum of the mass of the solute and the mass of the solvent. Therefore, the mass of the solution will be equal to 120 grams whether the salt gets dissolved in water and get disappeared.
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What instrument is used for measuring the heat energy absorbed or released in a chemical reaction?
C3Hg has a higher lower boiling point than C₂H6-
Answer:
C₃H₈ has a higher boiling point than C₂H₆
Explanation:
The boiling point is the temperature at which the intermolecular forces between molecules are overcome and the state of the substance changes from liquid to gas.
Since these are both hydrocarbons (molecules containing just carbon and hydrogen), the strength of their intermolecular bonds should be the same. However, since C₃H₈ is larger, it can form more of these intermolecular bonds. Thus, it takes more energy and a higher temperature to overcome the increased amount of forces.
How many moles of iron atoms are obtained from 320kg of iron oxide
Answer: 4010 mol of iron atoms
Explanation:
Given Information
Iron Oxide = Fe₂O₃
Mass = 320 kg
Given atomic mass / molecular weight
Fe = 55.8 g / mol
O = 16.0 g / mol
Fe₂O₃ = 55.8 × 2 + 16.0 × 3 = 159.6 g / mol
Given formula
n = m / M
n = number of molesm = massM = molecular weightConvert the unit of mass to Gram
1 kg = 1000 g
320 kg = 320 × 1000 = 320 000 g
Substitute values into the given formula
n = m / M
n = (320000) / (159.6)
n ≈ 2005 mol of Fe₂O₃
Calculate the number of moles of Fe (Iron atoms)
Since each mole of Fe₂O₃ has 2 moles of Fe, then:
2005 × 2 =[tex]\Large\boxed{4010~mol~of~Fe}[/tex]
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Which of the following factors would reduce the yield of a reaction?
A. The reaction produces a large quantity of heat.
B. The products are more stable than the reactants.
C. The reaction may be reversible.
D. The reaction occurs very quickly.
The products being more stable than the reactants is the factor which would reduce the yield of a reaction and is denoted as option B under standard conditions.
What is a Chemical reaction?This is the process in which one or more substances which are referred to as reactants are converted into new substances which we call the products.
A chemical reaction involves atoms exhibiting different bond formation so as to ensure they acquire an octet configuration and promotes proper stability of the products.
When the products are more stable than the reactants it means it is unable to form other products thereby decreasing the yield which is why it was chosen as the most appropriate choice.
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A 1. 30-g sample of an unknown gas occupies 798 ml at 25. 0°Cand a pressure of 1. 00 atm. Find the molar mass of the gas.
A 1. 30-g sample of an unknown gas occupies 798 ml at 25. 0°C and a pressure of 1. 00 atm the the molar mass of the gas is
Calculation ,
According to ideal gas equation ,
PV = nRT ....(i)
where P is the pressure = 1atm
V is the volume of the unknown gas = 798 ml = 0.798 L
R is the universal gas constant = 0.082 atm L /K mol
T is the temperature of the gas = 25 °C = 298 K
n is the number of moles = ?
By putting the value of pressure , volume , temperature and universal gas constant in equation ( i) we get
1 atm ×0.798 L = n×0.082×298
n = 1 atm ×0.798 L/0.082×298 = 0.0326 mole
Number of moles (n) = given mass/ molar mass
molar mass = given mass/number of moles = 1. 30 g/0.0326 mole
molar mass = 39.87 g/mol
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Thermite is a compound often used in the metalworking and construction industries. thermite can be produced from aluminum and iron oxide according to this reaction:_______.
thermite can be produced from aluminum and iron oxide according to redox reaction.
Redox reaction is defined as the the reaction in which one substance get oxidised and other one is reduced. In other words, Oxidation reduction reaction is called redox reaction.
Oxidation is termed as gain of electron and Reduction is termed as lose of electron.
Thermite is a mixture of an oxide of one metal and a powder of another metal.
Aluminium is usually used as a metal that basically decreases the oxide of the metal.
The thermite contains a mass ratio of ferric oxide and aluminium of 3:1.
It is used to weld broken iron pieces thermally. The reduction of aluminium ferric oxide is extremely exothermic, so the iron produced would be in the molten state.
Fe2O3+2Al→Al2O3+2Fe+heat
Thus, redox reaction of aluminum and ferrous oxide produce thermite.
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What is the purpose of adding 0. 1% agar to the trypticase nitrate broth when conducting the nitrate reduction test?.
Agar is used to assist establish an anaerobic environment that promotes nitrate reduction.
Nitrate Reduction test:
The nitrate in the broth is converted to nitrite by organisms that can produce the nitrate reductase enzyme, which can then be further converted to nitric oxide, nitrous oxide, or nitrogen. Anaerobic respiration and denitrification are two processes that can convert nitrate to a variety of compounds. While denitrification only reduces nitrate to molecular nitrogen, anaerobic respiration employs nitrate as the bacterium's final electron acceptor, reducing it to a range of chemicals.The nitrate reduction test is based on the detection of nitrite and its capacity to produce a red precipitate (prontosil), which is a water-soluble azo dye, when it combines with sulfanilic acid to create a complex (nitrite-sulfanilic acid).Learn more about the Nitrate reduction test with the help of the given link:
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How many milliliters of an 16m (h2so4) solution is required to prepare 2. 0×10^3ml of 0. 15m solution?
18mL of a 16M H₂SO₄ solution is required to prepare.
Dilution is the process of lowering a solute's concentration in a solution. It usually just involves mixing the solution with more solvent, and much more water. A solution is diluted when more solvent is added without increasing solute. The final mixture is thoroughly mixed to make sure that every component is the same.
The formula for the dilution of a solution is
M₁V₁ = M₂V₂
where,
M is molarity and V is the volume of the solution in liters.
Known,
M₁ = 16M = 16 mol/ L
M₂ = 0.15M = 0.15 mol / L
V₂ = 2.0 × [tex]10^3[/tex] ml
= 2L
∴ [tex]V_1 =\frac{M_2 V_2}{M_1}[/tex]
[tex]V_1 = \frac{0.15 * 2}{16}[/tex]
[tex]= \frac{0.3}{16}[/tex]
[tex]= 0.018 L[/tex]
[tex]V_1 = 0.018L[/tex] × [tex]1000 mL[/tex]
[tex]= 18 mL[/tex]
Therefore, 18mL of a 16M H₂SO₄ solution is required to prepare.
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A solution of acetic acid, hc2h3o2, on a laboratory shelfwas of undetermined concentration. if the ph of the solution wasfound to be 2. 68, what was the concentration of the acetic acid?
A solution of acetic acid , on a laboratory shelf was of undetermined concentration. if the pH of the solution was found to be 2. 68 , then its the concentration of the acetic acid was 2×[tex]10^{-3}[/tex]
Calculation ,
A figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.
We have to find concentration of the acetic acid .
pH = 2. 68
pH = -㏒[ [tex]H^{+}[/tex] ]
2. 68 = -㏒[ [tex]H^{+}[/tex] ]
[ [tex]H^{+}[/tex] ] = [tex]10^{-2.68}[/tex]
[ [tex]H^{+}[/tex] ] = 2×[tex]10^{-3}[/tex]
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What do the solubility rules tell you about the way to separate the second group of cations?
The second set of cations can be separated using solubility-product constants.
The creation of a new bond between the molecules of the solute and the solvent is known as solubility. Solubility is the greatest amount of solute that can be dissolved in a known amount of solvent at a specific temperature.
The amount of oil that will dissolve in the water column at a specific temperature and pressure is known as its solubility in water. The compound's water solubility increases with increasing polarity. The high water solubility of BTEX chemicals is one reason why they are found in groundwater so frequently. The ability of a medicine to dissolve is essential to its effectiveness. A drug substance cannot be absorbed without it, which results in limited bioavailability.
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The IR spectrum of a solid can be taken by dissolving it to create a solution. An appropriate solvent is?
The IR spectrum of a solid can be taken by dissolving it to create a solution. An appropriate solvent is carbon tetrachloride as its IR stretches are( only in tne fingerprint region) not visible in the region of infrared.
Non-polar solvents do not show peaks at the region of IR frequency because they do not have dipoles which absorb the infrared light. However, it has been noted that some of these solvent interfere the reaction spectra or absorb within the range of spectra. This property makes them suitable solvents in IR Spectroscopy.
Therefore non-polar solvents such as CCl4 or Carbon disulfide are appropriate for the IR spectrum. They also do not interfere with the halide disks used in the spectrometer, as a solvent like water would.
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If 2. 0 x 1023 argon {ar) atoms strike 4. 0 cm2 of wall per second at a 90° angle to the wall when moving with a speed of 45,000 cm s-1, what pressure {in atm) do they exert on the wall?
If 2. 0 x 1023 argon {Ar) atoms strike 4. 0 [tex]cm^{2}[/tex] of wall per second at a 90° angle to the wall when moving with a speed of 45,000 [tex]cm^{-1}[/tex].The pressure will be 0.295 atm.
The force delivered perpendicularly to an object's surface per unit area across which that force would be dispersed is known as pressure. In comparison to the surrounding pressure, gauge pressure defines the pressure. The units was using to express pressure vary.
Calculation of force:
Force excerted by the Ar atoms, (F) = Change in momentum for one Ar atom 7 / unit time × number of atom
F = 2mv /1s × number of atoms.
Putting the given data in above equation.
F = 2 × 39.95 amu × 450 m/s/ 1s × 1.66 × [tex]10^{-27}[/tex] kg /amu × 2 × [tex]10^{23}[/tex] atom
F = 11.94 N
Now, pressure can be calculated by using the formula:
P = Force exerted /area
P = 11.94 N/ 4.0 [tex]cm^{2}[/tex] × [tex]cm^{2}[/tex]/ [tex]10^{-4} m^{2}[/tex]
P = 0.295 atm
Therefore, the pressure will be 0.295 atm.
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If you purchase two new tires rather than four, you should put them on
If you purchase two new tires instead of four, you should put them on the rear means back side.
What should be done if you purchase only two tires?If you are here for a short answer on where the two new tires should be installed, always place the new tires on the rear when buying two tires instead of four. This is because more weight of car comes on the back tires so the new tires should be installed on the back tires of the car.
So we can conclude that If you purchase two new tires instead of four, you should put them on the rear means back side.
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What is the relationship between cubic centimetres and millimetres
Answer:
1 cc always equals 1 mL.
Explanation:
The primary difference is that milliliters are used for fluid amounts while cubic centimeters are used for solids. No matter what is being measured.
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A 21.496 grams sample of magnesium is burned in air to form magnesium oxide and magnesium nitride. When the products are treated with water,2.813 grams of gaseous ammonia are generated. Calculate the amounts of magnesium nitride and magnesium oxide formed?
25.898 g is the amount of magnesium nitride and magnesium oxide formed.
Step1 2Mg(s)+ O2(g)-----> 2 MgO(s)
3Mg(s)+N2(g)------> Mg3N2(s)
Mg3N2(s)+ 6 H2O(l)---> 3Mg(OH)2 + 2 NH3(g)
Step2 Moles of NH3 = (2.813/17)
Moles of Mg3N2= (1/2) Moles of NH3 = (2.813/2x17)= 2.813/34
Mass of Mg3N2 = (2.813/34) x100 =8.274g (Molar mass of Mg3N2=100)
Step3 Mass of Mg in Mg3N2 =(72/100) x8.274 =5.957g
Mass of Mg converted in MgO= 21.496-5.957=15.539
Moles of MgO= Moles of Mg = 15.539/24
Mass of MgO = 15.539x40/24 =25.898 g.
Magnesium is a cofactor for over 300 enzymatic systems that regulate various biochemical reactions in the body, including protein synthesis, muscle and nerve function, glycemic control, and blood pressure regulation [1-3].
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Calculate the standard potential, ∘, for this reaction from its δ∘ value. x(s) y2 (aq)⟶x2 (aq) y(s)δ∘=−61. 0 kj
The equilibrium potential and the standard free energy change can give the standard potential of the electrodes. The standard cell potential is 0.32 V.
What is standard free energy change?A reaction's standard free energy change (∆Gº') is the energy produced when the reactants undergo changes to form the product. It is given as,
ΔG° = -nFE° cell
Given,
Standard free energy change (ΔG°) = − 61. 0 kJ
Number of moles of electrons (n) = 2
Faraday's constant (F) = 96500 C
The standard cell potential (E° cell) is calculated as:
E° cell = ΔG° ÷ -nF
E° cell = − 61000 ÷ -(2 × 96500)
E° cell = 61000 ÷ 193000
= 0.32 V
Therefore, 0.32 V is the standard cell potential of the cell.
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Consider the Diels-Alder reaction of anthracene and maleic anhydride. What is the role of each of the reactants
The role of each of the reactants are:
The o=benzene (extra line+C)=o acts as the [Dienophile]The three benzene rings acts as the [diene]What is the Diels-Alder reaction?
The Diels–Alder reaction is known to be a kind of reaction that is said to exist between what we call a conjugated diene and that of an alkene (dienophile).
Note that the union of both leads to a unsaturated six-membered rings and because the reaction is one that entails the formation of a cyclic product through what we call a cyclic transition state, it is said to be known as a "cycloaddition".
Note that from the experiment, The role of each of the reactants are:
The o=benzene (extra line+C)=o acts as the [Dienophile]The three benzene rings acts as the [diene]Learn more about Diels-Alder reaction from
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A 1. 3×10−6mol sample of sr(oh)2 is dissolved in water to make up 25. 0 ml of solution. what is the ph of the solution at 25. 0∘c?
The pH of the solution at 25 degree celsius of 1.3 × 10⁻⁶ moles of a sample of Sr(OH)₂ is 10.02.
How do we calculate pH?The pH of any solution gives an idea about the acidic and basic nature of the solution and the equation of pH will be represented as:
pH + pOH = 14
Given that,
Moles of Sr(OH)₂ = 1.3 × 10⁻⁶ mol
Volume of solution = 25mL = 0.025L
The concentration of Sr(OH)₂ in terms of molarity = 1.3×10⁻⁶/0.025
= 5.2×10¯⁵M
Dissociation of Sr(OH)₂ takes place as:
Sr(OH)₂ → Sr²⁺ + 2OH⁻
From the stoichiometry of the reaction 1 mole of Sr(OH)₂ produces 2 moles of OH⁻.
Given that the base is a strong base and that it entirely dissociates into its ions, the hydroxide ion concentration is 5.2×10¯⁵×2 = 1.04×10¯⁴ M.
pOH = -log[OH⁻]
pOH = -log(1.04×10¯⁴)
pOH = 3.98
Now we put this value on the first equation we get,
pH = 14 - 3.98 = 10.02
Therefore, the value of pOH is 10.02.
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A sample of n2 occupies 3. 0l at 3. 0atm. What volume will it occupy when the pressure is changed to 0. 5atm and the temperature remain constant?
It will occupy 18 L volume when the pressure is changed to 0. 5 atm and the temperature remain constant.
Calculation,
According to Boyle law, the pressure of a given quantity of gas varies inversely with its volume at constant temperature.
[tex]P_{1} V _{1} = k[/tex] .....(i)
[tex]P_{1}[/tex] is initial pressure = 3 atm[tex]V _{1}[/tex] is initial volume = 3Lk is constant[tex]P_{2} V _{2} = k[/tex] (ii)
[tex]P_{2}[/tex] is final pressure = ?[tex]V _{2}[/tex] is final volume = 0.5atmk is constantCombining equation (i) and (ii). we get,
[tex]P_{1} V _{1} = P_{2} V _{2}[/tex]
3 atm× 3L= [tex]V _{2}[/tex]× 0.5atm
[tex]V _{2}[/tex] = 3 atm× 3L/0.5atm = 18 L
Boyle law used during respiration or breathing.
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A local plant nursery uses large sprinklers to water the plants twice a day. the water contains phosphorus, which is a fertilizer that helps plants grow. some of the water becomes runoff and ends up in nearby streams and lakes. this is an example of which type of short-term human-induced environmental change? eutrophication non-sustainable harvesting nonnative species introduction deforestation
Eutrophication
In an aged aquatic habitat like a lake, eutrophication is the progressive rise in the concentration of phosphorus, nitrogen, and other plant nutrients. As the volume of organic matter that can be converted into nutrients increases, the productivity or fertility of such an ecosystem also naturally rises.
What is Eutrophication ?Eutrophication may be caused by a number of things, including overuse of fertilisers, untreated sewage, the use of phosphorous-containing detergents, and industrial waste discharge.
Eutrophication naturally. Natural eutrophication is a process that develops in water resources over a very long period of time as a result of a slow buildup of nutrients and organic waste. Anthropogenic or cultural eutrophication.Learn more about Eutrophication here:
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Neptunium-237 was the first isotope of a transuranium element to be discovered. the decay constant is /s. what is the half-life in years? half-life = y
The half-life in years of Neptunium-237 which was the first isotope is 2.1 [tex]10^{6}[/tex] years.
Neptunium is most stable and Neptunium-237 is undergoes alpha decay, it means Neptunium-237 is decays by the emission of alpha particles . Seven alpha particles is emitted during decay of Neptunium-237. Neptunium-237 is radioactive actinide elements and first transuranium element.
The transuranium synthesis process involves creating a transuranium element through the transmutation process . The transmutation process is the process of creating heavy elements from light elements. Hence the process is the transmutation of light elements. There are two types: artificial and natural transmutation.
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what is the percent abundance of the size 4d nails in this sample. PLS ASAP
Answer:
? = 61.5%
Explanation:
To find the percent abundance of 4d nails, you need to use the following equation:
Percent Abundance = (number of nails / total nails) x 100%
Percent Abundance (4d) = (123 / 123 + 77) x 100%
= (123 / 200) x 100%
= 0.615 x 100%
= 61.5%
Americium–241 decays into neptunium–237. which correctly describes this process of radioactive decay? an unstable nucleus decays into a more stable nucleus. energy in the nucleus is converted into mass. the strong nuclear force splits the nucleus apart. the atom loses four protons.
When Americium–241 decays into neptunium–237, an unstable nucleus decays into a more stable nucleus.
What is Radioactive decay?
Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha decay (α-decay), beta decay (β-decay), and gamma decay (γ-decay), all of which involve emitting one or more particles. The weak force is the mechanism that is responsible for beta decay, while the other two are governed by the electromagnetism and nuclear force. A fourth type of common decay is Electron Capture, in which an unstable nucleus captures an inner electron from one of the electron shells. The loss of that electron from the shell results in a cascade of electrons dropping down to that lower shell, resulting in emission of discrete X-rays from the transitions. A common example is Iodine-125 commonly used in medical settings.Radioactive decay is a stochastic (i.e. random) process at the level of single atoms. According to quantum theory, it is impossible to predict when a particular atom will decay, regardless of how long the atom has existed. However, for a significant number of identical atoms, the overall decay rate can be expressed as a decay constant or as half-life. The half-lives of radioactive atoms have a huge range; from nearly instantaneous to far longer than the age of the universe.The decaying nucleus is called the parent radionuclide (or parent radioisotope), and the process produces at least one daughter nuclide.Except for gamma decay or internal conversion from a nuclear excited state, the decay is a nuclear transmutation resulting in a daughter containing a different number of protons or neutrons (or both). When the number of protons changes, an atom of a different chemical element is created.To learn more about Radioactive decay: https://brainly.com/question/1770619
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How can we increase the rate of collisions between the reactants in this reaction? mg 2hcl → mgcl2 h2
The frequency of collisions between the two reactants increases as the concentration of the reactants increases. When collisions happen, they don't always cause a reaction (atoms misaligned or insufficient energy, etc.). Higher concentrations result in more collisions and reaction opportunities.
Increasing a reactant's surface area increases the frequency of collisions and thus the reaction rate. The surface area of several smaller particles is greater than that of a single large particle. The greater the available surface area for particles to collide, the faster the reaction will occur.
How does concentration affect the rate of collisions between reactants?Thus, we can conclude that by increasing the concentration of Mg in the reaction mixture we increase the rate of collisions between the reactants in this reaction.
What does the half reaction of an oxidation-reduction reaction show?Iron gains electrons in the half reaction of an oxidation-reduction reaction. What does iron's electron gain mean? It has been reduced. Predict the product that will precipitate out of the reaction using the solubility rules and the periodic table.
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In the lewis structure of HCN. How many nonbonded (lone) electron pairs are present?
In lewis structure of HCN, we can observe one lone pair of electron.
The 7 protons in the nitrogen nucleus are balanced by the 3 electrons from the triple bond, the 2 electrons from its lone pair, and the 2 inner core electrons that make up the nitrogen nucleus. As a result, nitrogen is formally neutral.What is meant by lewis structure?The valence shell electrons in a molecule are depicted in an extremely simplified manner by a Lewis Structure. It is used to demonstrate how the electrons in a molecule are positioned around particular atoms. Electrons are shown as "dots" or, in the case of a bond, as a line connecting the two atoms.How should a Lewis structure be written?Step 1: Finding the total amount of valence electrons.Step 2: Outline the molecule's skeletal structure. Step 3: Form each bond in the skeletal structure using two valence electrons. Step 4: Try to distribute the leftover valence electrons as nonbonding electrons in order to fill the atoms' octets.To learn more about lewis structure visit:
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3.0 mol Na reacts with 1.4 mol F2 according to the equation below:
2Na+F2= 2NaF
How many moles of NaF form from 1.4 mol F2?
Taking into account the reaction stoichiometry, 2.8 moles of NaF are formed when 3.0 mol Na reacts with 1.4 mol F₂.
Reaction stoichiometryIn first place, the balanced reaction is:
2 Na + F₂ → 2 NaF
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Na: 2 molesF₂: 1 mole2 NaF: 2 molesLimiting reagentThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
Limiting reagent in this caseTo determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 2 moles of Na reacts with 1 mole of F₂, 3 moles of Na reacts with how many moles of F₂?
[tex]amount of moles of F_{2} =\frac{3 moles of Nax 1 moles of F_{2}}{2 moles of Na}[/tex]
amount of moles of F₂= 1.5 moles
But 1.4 moles of F₂ are not available, 1.4 moles are available. Since you have less moles than you need to react with 3 moles of Na, F₂ will be the limiting reagent.
Mass of NaF formedThe following rule of three can be applied: if by reaction stoichiometry 1 mole of F₂ form 2 moles of NaF, 1.4 moles of F₂ form how much mass of NaF?
[tex]moles of NaF=\frac{1.4 moles of F_{2}x2 moles of NaF }{1 mole of F_{2} }[/tex]
moles of NaF= 2.8 moles
Then, 2.8 moles of NaF are formed when 3.0 mol Na reacts with 1.4 mol F₂.
Learn more about the reaction stoichiometry:
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2.04 thermal and chemical change
Explanation:
thermal changes are those in which heat exchange is involved like endothermic and exothermic
while in chemical changes collision between the reactant occurs which result into product