Question 1

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 0.2845 g of CO2 and 0.1451 g of H2O.What is the empirical formula of the compound?

Accepted Answer

A)  CH2
B)  C4H5
C)  C4H10
D)  C5H2E) All of the above
F) C) and D)

Question 2

Which one of the following is not an empirical formula?

Accepted Answer

A)  CHO
B)  CH2O
C)  C2H4O
D)  C2H4O2E) None of the above
F) B) and D)

Question 3

1.00 mole of O2 contains the same number of molecules as

Accepted Answer

A)  0) 667 mole of O3.
B)  1) 00 mole of CH3CO2H.
C)  2) 00 mole of CH3CH2OH.
D)  All of theseE) None of the above
F) A) and B)

Question 4

What is the mass of a single fluorine molecule,F2?

Accepted Answer

A)  3) 155 × 10- 23 g
B)  6) 310 × 10- 23 g
C)  19.00 g
D)  38.00 gE) A) and B)
F) None of the above

Question 5

How many Fe(II) ions are there in 20.0 g of FeSO4?

Accepted Answer

A)  2) 19 × 10- 25 iron(II) ions
B)  7) 92 × 1022 iron(II) ions
C)  4) 57 × 1024 iron(II) ions
D)  1) 82 × 1027 iron(II) ionsE) All of the above
F) C) and D)

Question 6

Isoeugenol is the compound which gives the characteristic odor to nutmeg and contains carbon,hydrogen,and oxygen.If a 0.500 g sample of isoeugenol is combusted it gives 1.341 g of CO2 and 0.329 g of H2O.Isoeugenol has a molecular weight of 164 g/mol.What is the molecular formula of isoeugenol?

Accepted Answer

A)  C2HO
B)  C5H6O
C)  C8H4O4
D)  C10H12O2E) None of the above
F) All of the above

Question 7

Which substance is the limiting reactant when 2.0 g of sulfur reacts with 3.0 g of oxygen and 4.0 g of sodium hydroxide according to the following chemical equation:
2 S(s) + 3 O2(g) + 4 NaOH(aq) → 2 Na2SO4(aq) + 2 H2O(l)

Accepted Answer

A)  S(s) 
B)  O2(g) 
C)  NaOH(aq) 
D)  None of these substances is the limiting reactant.E) A) and B)
F) A) and C)

Question 8

What is the sum of the coefficients when the following equation is balanced using the lowest whole-numbered coefficients?
_____ PH3(g) + _____ O2(g) → _____ P4O10(s) + _____ H2O(g)

Accepted Answer

A)  10
B)  12
C)  19
D)  22E) C) and D)
F) A) and B)

Question 9

What volume of a 0.540 M NaOH solution contains 11.5 g of NaOH?

Accepted Answer

A)  0) 155 L
B)  0) 532 L
C)  1) 88 L
D)  6) 44 LE) C) and D)
F) B) and C)

Question 10

How many chloride ions are there in 4.50 mol of aluminum chloride?

Accepted Answer

A)  3) 00 chloride ions
B)  13.5 chloride ions
C)  2) 71 × 1024 chloride ions
D)  8) 13 × 1024 chloride ionsE) A) and D)
F) All of the above

Question 11

A student prepared a stock solution by dissolving 10.0 g of KOH in enough water to make 150.mL of solution.She then took 15.0 mL of the stock solution and diluted it with enough water to make water to make 65.0 mL of a final solution.What is the concentration of KOH for the final solution?

Accepted Answer

A)  0) 274 M
B)  0) 356 M
C)  2) 81 M
D)  3) 65 ME) C) and D)
F) B) and D)

Question 12

Which one of the following compounds contains the smallest percent oxygen by mass?

Accepted Answer

A)  CO2
B)  N2O4
C)  P4O10
D)  SO2E) None of the above
F) All of the above

Question 13

Analysis of a 1.000-g sample of the oral hypoglycemic agent metformintm yielded 0.3720 g
of carbon,0.0858 g of hydrogen,and 0.5422 g of nitrogen.Metformintm has a molar mass of
129.16 g/mol.What is the molar mass of Metformintm?

Accepted Answer

Question 14

If the percent yield for the following reaction is 75.0%,and 45.0 g of NO2 are consumed in the reaction,how many grams of nitric acid,HNO3(aq) are produced?
3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)

Accepted Answer

A)  30.8 g
B)  41.1 g
C)  54.8 g
D)  69.3 gE) B) and C)
F) A) and D)

Question 15

If the percent yield for the following reaction is 65.0%,how many grams of KClO3 are needed to produce 42.0 g of O2?
2 KClO3(s) → 2 KCl(s) + 3 O2(g)

Accepted Answer

A)  69.7 g
B)  107 g
C)  165 g
D)  371 gE) A) and B)
F) A) and C)

Question 16

How many oxygen atoms are in 3.00 g of sodium dichromate,Na2Cr2O7?

Accepted Answer

A)  0) 0801 oxygen atoms
B)  9) 85 × 1020 oxygen atoms
C)  6) 90 × 1021 oxygen atoms
D)  4) 83 × 1022 oxygen atomsE) A) and B)
F) B) and C)

Question 17

When 11.0 g of calcium metal is reacted with water,5.00 g of calcium hydroxide is produced.Using the following balanced equation,calculate the percent yield for the reaction?
Ca(s) + 2 H2O(l) → Ca(OH) 2(aq) + H2(g)

Accepted Answer

A)  12.3%
B)  24.6%
C)  45.5%
D)  84.0%E) A) and D)
F) All of the above

Question 18

Which of the following has the greatest mass?

Accepted Answer

A)  6) 0 × 1023 atoms of O
B)  3) 0 × 1023 molecules of O2
C)  2) 0 × 1023 molecules of O3
D)  All have the same mass.E) A) and B)
F) A) and C)

Question 19

Which one of the following is an empirical formula?

Accepted Answer

A)  C2F6
B)  H2SO4
C)  N2H4
D)  P4O10E) B) and C)
F) A) and B)

Question 20

A student prepared a stock solution by dissolving 20.0 g of KOH in enough water to make 150.mL of solution.She then took 15.0 mL of the stock solution and diluted it with enough water to make 65.0 mL of a final solution.What is the concentration of KOH for the final solution?

Accepted Answer

A)  0) 548 M
B)  0) 713 M
C)  1) 40 M
D)  1) 82 ME) C) and D)
F) B) and C)

Exam 3: Formulas, equations, and Moles

Analysis of a 1.000-g sample of the oral hypoglycemic agent metformintm yielded 0.3720 g of carbon,0.0858 g of hydrogen,and 0.5422 g of nitrogen.Metformintm has a molar mass of 129.16 g/mol.What is the molar mass of Metformintm?

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How many Fe(II) ions are there in 20.0 g of FeSO4?

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What volume of a 0.540 M NaOH solution contains 11.5 g of NaOH?

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Which substance is the limiting reactant when 2.0 g of sulfur reacts with 3.0 g of oxygen and 4.0 g of sodium hydroxide according to the following chemical equation: 2 S(s) + 3 O2(g) + 4 NaOH(aq) → 2 Na2SO4(aq) + 2 H2O(l)

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What is the mass of a single fluorine molecule,F2?

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Isoeugenol is the compound which gives the characteristic odor to nutmeg and contains carbon,hydrogen,and oxygen.If a 0.500 g sample of isoeugenol is combusted it gives 1.341 g of CO2 and 0.329 g of H2O.Isoeugenol has a molecular weight of 164 g/mol.What is the molecular formula of isoeugenol?

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When 11.0 g of calcium metal is reacted with water,5.00 g of calcium hydroxide is produced.Using the following balanced equation,calculate the percent yield for the reaction? Ca(s) + 2 H2O(l) → Ca(OH) 2(aq) + H2(g)

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A student prepared a stock solution by dissolving 20.0 g of KOH in enough water to make 150.mL of solution.She then took 15.0 mL of the stock solution and diluted it with enough water to make 65.0 mL of a final solution.What is the concentration of KOH for the final solution?

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Which one of the following is not an empirical formula?

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Which one of the following is an empirical formula?

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Which one of the following compounds contains the smallest percent oxygen by mass?

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Which of the following has the greatest mass?

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How many oxygen atoms are in 3.00 g of sodium dichromate,Na2Cr2O7?

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If the percent yield for the following reaction is 75.0%,and 45.0 g of NO2 are consumed in the reaction,how many grams of nitric acid,HNO3(aq) are produced? 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)

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How many chloride ions are there in 4.50 mol of aluminum chloride?

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What is the sum of the coefficients when the following equation is balanced using the lowest whole-numbered coefficients? _____ PH3(g) + _____ O2(g) → _____ P4O10(s) + _____ H2O(g)

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1.00 mole of O2 contains the same number of molecules as

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Combustion analysis of an unknown compound containing only carbon and hydrogen produced 0.2845 g of CO2 and 0.1451 g of H2O.What is the empirical formula of the compound?

Correct AnswerverifiedShow Answer

A student prepared a stock solution by dissolving 10.0 g of KOH in enough water to make 150.mL of solution.She then took 15.0 mL of the stock solution and diluted it with enough water to make water to make 65.0 mL of a final solution.What is the concentration of KOH for the final solution?

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If the percent yield for the following reaction is 65.0%,how many grams of KClO3 are needed to produce 42.0 g of O2? 2 KClO3(s) → 2 KCl(s) + 3 O2(g)

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Analysis of a 1.000-g sample of the oral hypoglycemic agent metformin^tm yielded 0.3720 g of carbon,0.0858 g of hydrogen,and 0.5422 g of nitrogen.Metformin^tm has a molar mass of 129.16 g/mol.What is the molar mass of Metformin^tm^?

Correct Answer
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How many Fe(II) ions are there in 20.0 g of FeSO₄?

Correct Answer
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Correct Answer
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Which substance is the limiting reactant when 2.0 g of sulfur reacts with 3.0 g of oxygen and 4.0 g of sodium hydroxide according to the following chemical equation: 2 S(s) + 3 O₂(g) + 4 NaOH(aq) → 2 Na₂SO₄(aq) + 2 H₂O(l)

Correct Answer
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What is the mass of a single fluorine molecule,F₂?

Correct Answer
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Isoeugenol is the compound which gives the characteristic odor to nutmeg and contains carbon,hydrogen,and oxygen.If a 0.500 g sample of isoeugenol is combusted it gives 1.341 g of CO₂ and 0.329 g of H₂O.Isoeugenol has a molecular weight of 164 g/mol.What is the molecular formula of isoeugenol?

Correct Answer
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When 11.0 g of calcium metal is reacted with water,5.00 g of calcium hydroxide is produced.Using the following balanced equation,calculate the percent yield for the reaction? Ca(s) + 2 H₂O(l) → Ca(OH) ₂(aq) + H₂(g)

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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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How many oxygen atoms are in 3.00 g of sodium dichromate,Na₂Cr₂O₇?

Correct Answer
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If the percent yield for the following reaction is 75.0%,and 45.0 g of NO₂ are consumed in the reaction,how many grams of nitric acid,HNO₃(aq) are produced? 3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g)

Correct Answer
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Correct Answer
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What is the sum of the coefficients when the following equation is balanced using the lowest whole-numbered coefficients? ___ PH₃(g) + _ O₂(g) → _ P₄O₁₀(s) + ___ H₂O(g)

Correct Answer
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1.00 mole of O₂ contains the same number of molecules as

Correct Answer
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Combustion analysis of an unknown compound containing only carbon and hydrogen produced 0.2845 g of CO₂ and 0.1451 g of H₂O.What is the empirical formula of the compound?

Correct Answer
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Correct Answer
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If the percent yield for the following reaction is 65.0%,how many grams of KClO₃ are needed to produce 42.0 g of O₂? 2 KClO₃(s) → 2 KCl(s) + 3 O₂(g)

Correct Answer
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