Answers
Answer:
0.717 M LiOH
Explanation:
(Step 1)
Calculate the moles of H₃PO₄ using the molarity equation.
29.15 mL / 1,000 = 0.02915 L
Molarity = moles / volume (L)
0.205 M = moles / 0.02915 L
0.00598 = moles
(Step 2)
Convert moles H₃PO₄ to moles LiOH using the mole-to-mole ratio from reaction coefficients.
1 H₃PO₄ + 3 LiOH -----> Li₃PO₄ + 3 H₂O
^ ^
0.00598 moles H₃PO₄ 3 moles LiOH
------------------------------------ x -------------------------- = 0.0179 moles LiOH
1 mole H₃PO₄
(Step 3)
Calculate the molarity of LiOH using the molarity equation.
25.0 mL / 1,000 = 0.0250 L
Molarity = moles / volume (L)
Molarity = 0.0179 moles / 0.0250 L
Molarity = 0.717 M
Related Questions
please answer the question so i can make sure I got them right! thank you :)
Answers
pH = pKa + log [conj.base]/[acid]
Let the concentration of the conjugate base = x
=> The concentration of the acid is also x (As the acid concentration is equivalent to that of the conjugate base)
for CH₃COOH=0.50 M and CH₃COO=0,25 M
pH = pKa + log [salt]/[acid]
pKa = -log Ka = -log 1.8x10-5 = 4.74
pH = 4.74 + log (0.50 M/1.0 M) = 4.74 + log 0.5 = 4.74 + (-0.3)
pH = 4.74 - 0.3
pH = 4.44
For0.20 M Na2CO3
pH=−log[H+]
=−log (1.54×10−12)
=11.8
for HNO₂
Kb = 2.17X10^-11 = x^2 / 0.148
x = [OH-] = 1.79X10^-6
pOH = 5.747
pH = 14.000 - pOH = 8.253
for HPO₄³⁻
= [HPO₄³⁻] [PO₄³⁻] [H +]/×10⁻³
=[PO₄³⁻]5.464×10⁻¹⁸
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A solution of dextrose contains 25.0 g solute in 250.0 g water. How should the percentage by mass of dextrose in this solution be calculated?
Answers
Answer:
9.10% dextrose
Explanation:
To find the mass percent, you need to use the following equation:
mass (g) of solute
Mass Percent = --------------------------------- x 100%
mass (g) of solution
You can plug the given values into the equation and solve to find the mass percent of dextrose. But first, you need to calculate the mass of the solution.
Mass (solute): 25.0 g
Mass (solution): 250.0 g + 25.0 g = 275 g
25.0 grams
Mass Percent = ------------------------ x 100%
275 grams
Mass Percent = 0.0909 x 100%
Mass Percent = 9.10%
A solution of dextrose contains 25.0 g solute in 250.0 g water. 9.10% is the percentage by mass of dextrose in this solution.
A component's concentration in a combination or compound can be expressed as a mass percent, also known as a weight percent. It shows how much of the total mass of the solution or mixture is made up of the solute's (component's) mass. In chemistry, mass percent is frequently employed and stated as a percentage.
Mass Percent = mass (g) of solute/ mass (g) of solution x 100%
Mass (solute): 25.0 g
Mass (solution): 250.0 g + 25.0 g = 275 g
Mass Percent =25.0 grams / 275 grams x 100%
Mass Percent = 0.0909 x 100%
Mass Percent = 9.10%
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An ion of a single pure element always has an oxication number of
A. magnitude equal to its atomic number
OB. 1
OC.0
OD. None of these
Answers
Answer:
C. zero 0
Explanation:
single elements will always possess an oxication number of zero
A sample of a gas (15.0 mol) at 2.0 atm is expanded at constant temperature from 5 L to 19.5 L. calculate the final pressure.
Answers
Answer:
.512 ATM
Explanation:
P1V1 = P2V2
2 * 5 = P2 * 19.5
P2 = .512 ATM
How many molecules in 5.68 g of ozone (O3)
Answers
Answer:
[tex]\boxed{\sf no.\ of \ molecules = 7.13 \times 10^{22} \ molecules}[/tex]
Explanation:
Given data::Mass in g = m = 5.68 g
Molar mass = M = (16)3 = 48 g/mol
Avogadro's number = [tex]N_A[/tex] = 6.023 × 10²³
Required:No. of molecules = ?
Formula:[tex]\displaystyle no.\ of \ molecules = \frac{m}{M} \times N_A[/tex]
Solution:Put the givens in the above formula
[tex]\displaystyle no. \ of \ molecules =\frac{5.68}{48} \times 6.023 \times 10^{23}\\\\no. \ of\ molecules = 0.12 \times 6.023 \times 10^{23}\\\\no. \ of \ molecules = 0.713\times 10^{23}\\\\no.\ of \ molecules = 7.13 \times 10^{22} \ molecules\\\\\rule[225]{225}{2}[/tex]
4 Fe(s) + 3 02(g)
--> 2 Fe₂O3(s)
1. What is the oxidation state of iron (Fe) in the reactant Fe(s)?
2. What is the oxidation state of oxygen (O) in the reactant O2(g)?
3. What is the oxidation state of iron (Fe) in the product Fe2O3(s)?
4. What is the oxidation state of oxygen (O) in the product Fe2O3(s)?
5. In this reaction, iron is... (oxidized or reduced?)
6. In this reaction, oxygen is... (oxidized or reduced?)
7. What was the oxidizing agent in this reaction: Fe(s) or O2(g)?
Answers
The oxidation number of reactant Fe is 0 while the oxidation number of iron in the product is +3
What s a redox reaction?The term redox reaction implies a reaction in which there is an increase in the oxidation number of a specie and the decrease in the oxidation number of another specie.
Now we have the answers as follows;
1) The oxidation number of reactant Fe is 0
2) The oxidation number of reactant oxygen is 0
3) The oxidation number of iron in the product is +3
4) The oxidation number of oxygen in the product is -2
5). Iron is oxidized in the reaction
6) Oxygen is reduced in the reaction
7) The oxidizing agent in this case is the oxygen atom
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In a perfect world, reactions can never go above 100% yield. However in reality you will sometimes get above 100% yield. Why?
Group of answer choices
A. Excess water and Impurities
B. Impurities Only
C. Excess Water Only
D. You can never have above 100% yield under any circumstance.
Answers
Answer:
You can never have above 100% yield under any circumstance
To solve such this we must know the concept of chemical reaction. Therefore, the correct option is option D that is you can never have above 100% yield under any circumstance.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
You can never have above 100% yield under any circumstance for any chemical reactions. Option D is the correct options among all the given options.
Therefore, the correct option is option D that is you can never have above 100% yield under any circumstance.
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Please help thank you so much
Answers
The two compounds that are the correct enol tautomers of 2-butnone are the structures shown in Option B.
What is Keto Enol Tautomerism?Isomerism is a situation in which two compounds have the same molecular formula but do not have the same structural formula. This occurs because the atoms in the molecule are arranged differently in space. One of the types of isomerism that we have is the Keto Enol Tautomerism. The Keto Enol Tautomerism occurs between the Keto and the enol forms of a compound via the movement of electrons. It is common in ketone compounds.
In this case, we can see that the compound 2-butanone can give rise to two enol compounds that have the same molecular formula as the 2-butanone.
The two compounds that are the correct enol tautomers of 2-butnone are the structures shown in Option B.
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The following reaction: HF(aq) <--> H+(aq) + F-(aq) has an equilbirum constant (K) value of 7.2 x 10-4. This means that the reaction proceeds essentially to completion.
Group of answer choices
True
False
Answers
Given an equilibrium constant value of 7.2 x 10-4 it is false to say that the reaction proceeds essentially to completion.
What is the equilibrium constant?In a reaction, we can judge using the value of the equilibrium constant weather or not the reaction moves on to completion. If the reaction moves up to completion, it the follows that the value of the equilibrium constant ought to be large.
On the other hand, when we have a case that the equilibrium constant is small and is not so large, then the reaction does not proceed essentially to completion.
Given an equilibrium constant value of 7.2 x 10-4 it is false to say that the reaction proceeds essentially to completion.
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Quick explanation please i'm having trouble
Two different atoms have nine protons each and the same mass. However, one is neutral while the other has a negative charge. Describe what each atomic structure could be, listing the possible number and location of all subatomic particles.
Answers
Perform the following mathematical operation and report the answer to the appropriate number of significant figures. 5.4-4.21
Answers
Answer:
1.2 ( two significant digits)
Explanation:
5.4 - 4.21 answer should only have the the number of significant digits as the number in the equation with the least number of significant digits... in this case 5.4 is only two significant digits....so the answer should only have two significant digits
5.4 - 4.21 = 1.19 round to two digits = 1.2
Based on periodic trends and the data in the table above, which of the following is the most probable value for the ionic radius of K+?
Answers
Based on periodic trends, the most probable value for the ionic radius of K⁺ is 133 pm.
What are periodic trends?
Periodic trends are the observation which are seen in the chemical and physical elements found in the periodic table.
Periodic trends is based on the periodicity of elements.
Periodicity is the variation seen in the chemical and physical properties of the elements in the period table in a regular pattern, both down the groups and across the periods.
The periodic trends observed in metallic ions is that ionic radius of metallic ions increase down a group but decreases across a period.
Based on this periodic trend, the most likely size of the potassium ion, K⁺ is 133 pm.
In conclusion, the ionic radius of metallic ions increase down a group and decrease across a period.
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select the common word on the outside of a shipping container that will alert you to the fact that the material inside is hazardous
Answers
The common word on the outside of a shipping container that will alert you to the fact that the material inside is hazardous is caution.
What are hazardous statements?Hazardous statements are those words or phrases that are labelled against chemicals which shows the degree of how dangerous the chemical are.
The common words that are used as hazardous statements which shows that a chemical is dangerous include the following:
Danger,Caution andWarning.Therefore, the common word on the outside of a shipping container that will alert you to the fact that the material inside is hazardous is caution.
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Why does direct titration of aspirin with NaOH have a side reaction and how to prevent it?
Answers
Direct titration of aspirin with NaOH have a side reaction simply because aspirin is a weak acid
What is direct titration?
Direct titration can simply be defined as a type of titration in which a titrant of known concentration and volume is added to a substance in order to analyze it.
As the name implies, it is called direct titration simply because the one approaches the endpoint of the experiment directly.
Furthermore, the significance of direct titration is that it is used to find the quantity of a substance within a solution with chemical reactions.
So therefore, direct titration of aspirin with NaOH have a side reaction simply because aspirin is a weak acid
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In the reaction:
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
How does the equilibrium shift if the HCl concentration is increased?
Group of answer choices
A. To the reactants
B. No change will occur
C. To the products
D. The equilibrium will initially shift but eventually be uneffected.
Answers
The equilibrium shift if the HCl concentration is increased to the product.
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
What is effect of concentration on equilibrium?If the concentration of a substance is changed, then the equilibrium will shift in such a way that it minimise the effect of change which occur. If we increase the concentration of a reactant, then the equilibrium will shift to minimize the changes in the direction of the reaction which uses the reactants, so that the reactant concentration decreases.
Factor affecting concentration of reactionThe temperature: As we increasing the temperature, the average speed of the reactant molecules also increases. As many molecules move faster, the large number of molecules moving fast enough to react increases, make the faster formation of products.pressure and concentration of the system are the factors which affect equilibrium.Thus, we concluded that with increase in the concentration of reactant equilibrium shift forward.
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At a certain temperature the reaction
CO2(g) + H2(g) ↔ CO(g) + H2O(g) has Kc = 2.50.
If 2.00 mol of carbon dioxide and 1.5 mol of hydrogen are placed in a 5.00 L vessel and equilibrium is established, what will be the concentration of carbon monoxide?
Answers
The concentration of carbon monoxide at equilibrium is 0.209 M.
Concentration of each gasCO2 = 2 mol/5 L = 0.4
H2 = 1.5 mol/5L = 0.3
ICE tableCreate ICE table as shown below
CO2(g) + H2(g) ↔ CO(g) + H2O(g)
I 0.4 0.3 0 0
C - x - x x x
E 0.4 - x 0.3 - x x x
Kc = [CO][H₂O] / [CO₂][H₂]
2.5 = (x²)/(0.4 - x)(0.3 - x)
x² = 2.5(0.4 - x)(0.3 - x)
x² = 2.5(0.12 - 0.7x + x²)
x² = 0.3 - 1.75x + 2.5x²
0 = 1.5x² - 1.75x + 0.3
solve the quadratic equation using formula method;
x = 0.209
Thus, the concentration of carbon monoxide at equilibrium is 0.209 M.
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Which of the following sets of elements could replace the generic "X" symbol with their own to produce a valid dot notation for the element(s)?
Select one:
a.
carbon, silicon, and germanium
b.
oxygen, sulfur, and selenium
c.
boron, aluminum, and gallium
d.
nitrogen, phosphorus and arsenic
Answers
Symbol "X" represents Nitrogen, phosphorus, and arsenic.as they have five valence electrons in their valance shell.
What is a Lewis notation?A Lewis form is a completely simplified illustration of the valence shell electrons in a molecule. it's miles used to expose how the electrons are organized round man or woman atoms in a molecule. Electrons are proven as dots or for bonding electrons as a line between the 2 atoms.
Lewis systems, also known as electron-dot structures or electron-dot diagrams, are diagrams that show the bonding between atoms of a molecule, and the lone pairs of electrons that can exist within the molecule.A Lewis form is based totally at the idea of the octet rule, wherein atoms percentage electrons in order that every atom has 8 electrons in its outer shell. for example, an oxygen atom has six electrons in its outer shell.
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What is the oxidation number of chlorine in KClO3?
Group of answer choices
A. +5
B. +1
C. -5
D. -1
Answers
The oxidation number of chlorine in KClO3 is +5 (option A).
How to calculate oxidation number?The oxidation number of an element is the hypothetical charge of an atom within a molecule.
The oxidation number of an element like chlorine in a compound like Pottasium chlorate can be calculated as follows:
The oxidation number of the elements in KClO3 is as follows:
K = +1Cl = xO = -21 + x - 2(3) = 0
x - 5 = 0
x = +5
Therefore, the oxidation number of chlorine in KClO3 is +5.
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us
Let's say that you were asked to find the
molecular formula for a compound given its
empirical formula, CH₂O, and the compound's
molar mass.
The first step in solving such a problem is to
calculate the molar mass for the empirical
formula. What is the molar mass of CH₂O?
(C=12.01 amu, H=1.008 amu, O=16.00 amu)
[?] g/mol CH₂0
1
Answers
Answer:
Molar mass = 30.026 g/mol
Explanation:
Let Molar mass be mm
mm of CH2O = 12.01 + 2(1.008) + 16.00
= 12.01 + 2.016 + 16.00 = 30.026 g/mol
A tire has a pressure of 1.8 atm at 20 degrees Celsius. At the end of a long trip, the tire pressure increased to 2.0 atm. What was the temperature of the air inside the tire (in degrees Celsius)?
Answers
Answer:
52.57 Celsius
Explanation:
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Gay-Lussac's law
P1/T1 = P2/T2
pressure 1 / temperature1 = pressure2 / temperature2
temperature has to be in kelvin
20 degrees Celsius is 293.15
1.8 / 293.15 = 2.0 / temperature2
1.8 / 293.15 = 2.0 / x
293.15 * 2.0 = 586.3
586.3 divided by 1.8 =
325.722222222 kelvin which is
52.57222222200005 Celsius
chemlibretextsorg
Consider the following reaction at 298K.
Pb2+ (aq) + Cu (s) Pb (s) + Cu2+ (aq)
Which of the following statements are correct?
Choose all that apply.
The reaction is product-favored.
delta G^o < 0
n = 4 mol electrons
K < 1
Eo cell < 0
Answers
The true statements are;
K < 0Eocel < 0What is a redox reaction?We define a redox reaction as one in which a specie is oxidized and another is reduced.
Now;
Eo cell = cell potential = -0.13 V - (+0.34 V) = -0.47 V
n =number of moles of electrons = 2 mole of electrons
K = equilibrium constant
ΔG = change in free energy
Eo cell = 0.0592/n log K
-0.47 = 0.0592/2 log K
log K = -0.47 * 2/0.0592
K = 1.3 * 10^-16
ΔG = -nFEo cell
ΔG = -(2 * 96500 * -0.47)
ΔG = 90.7kJ
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The symbol X in the following equation, 23/11 Na + 1/1H → 23/12 Mg + X, is a/an
Answers
Answer:
X = ¹₀n
Explanation:
The mass number is the total amount of neutrons and protons in the element. The atomic number is the total protons in the element. The mass number is the superscript and the atomic number is the subscript. The mass and atomic numbers must be balanced on both sides of the equation. The element can be identified by the atomic number.
In the event that we have an atomic number of zero, there is no element this represents, so the letter "n" should be used.
²³₁₁Na + ¹₁H → ²³₁₂Mg + X
Mass Number:
Reactants = Products
23 + 1 = 23 + ?
24 = 23 + ?
1 = ?
Atomic Number:
Reactants = Products
11 + 1 = 12 + ?
12 = 12 + ?
0 = ?
The complete equation is:
²³₁₁Na + ¹₁H → ²³₁₂Mg + ¹₀n
What is the mass of a 5.00cm3 piece of copper having a density of 8.96g/cm3
Answers
Answer:
44.8 grams
Explanation:
The density exists as a ratio comparing the mass of a piece of copper per 1 cm³. Since you have been given a new volume, you can set up a proportion to find the new mass.
[tex]\frac{8.96 grams}{1.00 cm^3} =\frac{?grams}{5.00cm^3}[/tex] <----- Proportion
[tex]44.8 = (1.00cm^3)(?grams)[/tex] <----- Cross-multiply
[tex]44.8= ?grams[/tex] <----- Divide both sides by 1.00
Which of the following elements has the highest electronegativity?
Group of answer choices
A. Boron
B. Nitrogen
C. Oxygen
D. Carbon
Answers
Answer:
The answer is Oxygen
The oxygen has the most electronegativity.
If I(to study),I(to pass)the exams
Answers
If I study, I will pass the exams.
Need the answer pretttty pleaseeeeee
Answers
Answer:
The answer would be D.
Explanation:
Whenever one has many of the same correlating numbers within in a pattern, the rest tend to follow. With the information I was given and not the actual plotting, that would be my answer.
Need the answer pretttty pleaseeeeee
Answers
Answer:
B.) their electrons are assigned to the s and p orbitals only
Explanation:
Once you get to the fourth row on the periodic table, the transition metals are introduced. The transition metals are located in the d-block and their electrons fill up d orbitals. When an element in the p-block (the right side of the table) is in one of these rows, the d-block has to fill up first.
How to calculate the exact molarity of phosphoric acid using the first equivalence point with the use of Diprotic and Triprotic Ka's?
Answers
As we know that the equivalency point of moles of added base will be equal to the moles of original acid, this allows to determine the number of moles of original acid.
How do you find the concentration at the first equivalence point?At the equivalency point the moles of added base will be equal to the moles of original acid, this allows the determination of the number of moles of original acid. This can be combined with the original volume of the analyte solution in order to determine its concentration.
So we can conclude that at the equivalence point the moles of added base will be equal to the moles of original acid, this allows the determination of the number of moles of original acid.
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In many regions of the world, humans rely on underground water supplies called aquifers for fresh water. The amount of water an aquifer can store depends in part on the porosity of the rock or sediment in which the water is stored. Porosity is a measure of the amount of liquid that can be stored in a material and is related to the amount of empty space that exists between individual rock or sediment particles. A group of civil engineers wants to determine whether the porosity of surface soil affects aquifer recharge rates-the ability of aquifers to refill with water. The engineers conduct the following study to determine the porosity of the surface soil at various locations. The results of the study will then be compared with the recharge rates of the aquifer each location supplies with water. 1. Collect one 200-milliliter (mL) sample of soil from each of three locations. 2. Place each soil sample in a beaker. 3. Add 200 mL of water to each sample and allow the water to saturate the soil. 4. Measure the amount of standing water in each beaker (amount of water the soil did not absorb). 5. Determine the amount of water in the soil sample by subtracting the amount of standing water from 200 mL. 6. Divide the amount of water in the soil sample by 200 mL and multiply by 100 to determine the percent porosity of the soil. Which change to the experimental design would improve the reliability of the engineers' measurements?
Answers
The change to the experimental design that would improve the reliability of the engineers' measurements is C. testing single samples from more than three locations
What is an experimental design?It should be noted that experimental design is the process of carrying out research in an objective as well as a controlled fashion in order for precision to be maximized and specific conclusions can be drawn from the hypothesis statement.
Based on the information, the locations selected are only three. Also, an area must have more types of soil with variable porosity. Hence, the collection of more soil samples may provide more accurate results than collecting soil samples from only three regions.
Therefore, change to the experimental design that would improve the reliability of the engineers' measurements is the testing single samples from more than three locations.
In conclusion, the correct option is C.
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Complete question:
Which change to the experimental design would improve the reliability of the engineers' measurements?
A. using a liquid other than water to determine porosity
B. using flasks instead of beakers
C. testing single samples from more than three locations
D. testing more samples from each location
URGENT
A chemical equilibrium between gaseous reactants and products is shown.
N2(g) + 3H2(g) ⇌ 2NH3(g)
How will the reaction be affected if the pressure on the system is increased?
It will shift toward the reactant side as there is lower pressure on the reactant side.
It will shift toward the product side as there is higher pressure on the product side.
It will shift toward the reactant side as there are a greater number of moles of gas on the reactant side.
It will shift toward the product side as there are a fewer number of moles of gas on the product side.
Answers
Answer:
Explanation:
Discussion
When Pressure increases equilibrium shifts to the side with the smallest number of moles. But which side is that?
N2(g) + 3H2(g) ⇌ 2NH3(g)
The left side has 1 mol of nitrogen (N2) and 3 moles of Hydrogen = 4 mols
on the left side.
The right side has 2 mols of NH3 = 2 mols on the right.
Conclusion: You tell the number of mols by the Balance numbers to the left of each chemical in an equation.
Since the left side N2 + 3H2 = 4 mols, the equilibrium does NOT shift left.
2NH3 is only two mols.
The equilibrium shifts Right
Answer
D