Question 1

What is the percent yield of C2H2 if 62.80g of water yields 15.38g of C2H2 using the following equation. CaC2(s) + 2 H2O(l) → Ca(OH) 2(aq) + C2H2(g)

Accepted Answer

A)   13.84%
B)   33.90%
C)   91.47%
D)   48.10%
E)   68.52%F) B) and C)
G) D) and E)

Question 2

Aluminum metal reacts with aqueous iron( III) oxide to form aqueous aluminum oxide and iron metal.What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest,whole-number stoichiometric coefficients?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) None of the above
F) A) and C)

Question 3

Balance the following equation.
________ C10H12 + ________ O2 → ________ H2O + ________ CO2

Accepted Answer

C₁₀H₁₂ + 13 O₂→...

Question 4

How many moles of BCl3 are needed to produce 5.00 g of HCl(aq) in the following reaction?
BCl3(g) + 3 H2O(l) → 3 HCl(aq) + B(OH) 3(aq)

Accepted Answer

A)   0. 0457 mol
B)   0. 137 mol
C)   0.411 mol
D)   21.9 molE) B) and D)
F) A) and B)

Question 5

Which substance is the limiting reactant when 8.0 g of sulfur reacts with 12 g of oxygen and 16 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 C)
F) All of the above

Question 6

Balance the following equation.
________ C9H20 + ________ O2 → ________ H2O + ________ CO2

Accepted Answer

C₉H₂₀ + 14 O₂→...

Question 7

Consider the following balanced reaction.What mass (in g) of CO2 can be formed from 288 mg of O2? Assume that there is excess C3H7SH present.
C3H7SH(l) + 6 O2(g) → 3 CO2(g) + SO2(g) + 4 H2O(g)

Accepted Answer

A)   0.396 g CO2
B)   0.209 g CO2
C)   0.792 g CO2
D)   0.126 g CO2
E)   0.198 g CO2F) None of the above
G) B) and C)

Question 8

Define a limiting reagent.

Accepted Answer

A limiting reagent is a reacta...

Question 9

How many molecules of H2S are required to form 79.0 g of sulfur according to the following reaction? Assume excess SO2.
2 H2S(g) + SO2(g) → 3 S(s) + 2H2O(l)

Accepted Answer

A)   1.48 × 1024 molecules H2S
B)   9.89 × 1023 molecules H2S
C)   5.06 × 1025 molecules H2S
D)   3.17 × 1025 molecules H2S
E)   2.44 × 1023 molecules H2SF) A) and D)
G) All of the above

Question 10

All of the following are examples of chemical properties EXCEPT

Accepted Answer

A)   the low pH of stomach acid.
B)   chlorophyll being responsible for the green color of leaves.
C)   heat being given off by the burning of natural gas in a kitchen stove.
D)   the rusting of an iron nail left out in the rain.
E)   the ability of a drain opener to unclog a drain using sodium hydroxide.F) None of the above
G) A) and E)

Question 11

When 14.0 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)   9.67%
B)   19.3%
C)   35.7%
D)   66.0%E) C) and D)
F) A) and B)

Question 12

A 12.39 g sample of phosphorus reacts with 42.54 g of chlorine to form only phosphorus trichloride (PCl3) .If it is the only product,what mass of PCl3 is formed?

Accepted Answer

A)   30.15 g
B)   54.93 g
C)   140.01 g
D)   79.71 g
E)   91.86 gF) All of the above
G) B) and E)

Question 13

Determine the theoretical yield of HCl if 60.0 g of BCl3 and 37.5 g of H2O are reacted according to the following balanced reaction.A possibly useful molar mass is BCl3 = 117.16 g/mol. BCl3(g) + 3 H2O(l) → H3BO3(s) + 3 HCl(g)

Accepted Answer

A)   75.9 g HCl
B)   132 g HCl
C)   187 g HCl
D)   56.0 g HCl
E)   25.3 g HClF) A) and E)
G) B) and E)

Question 14

Global warming is thought to be caused by the increase of one particular gas.Name the gas.

Accepted Answer

A)   oxygen
B)   carbon monoxide
C)   carbon dioxide
D)   nitrogen
E)   heliumF) B) and D)
G) All of the above

Question 15

Two samples of potassium iodide are decomposed into their constituent elements.The first sample produced 13.0 g of potassium and 42.3 g of iodine.If the second sample produced 24.4 kg of potassium,how many kg of iodine were produced?

Accepted Answer

A)   13.3 kg
B)   22.5 kg
C)   79.4 kg
D)   44.4 kg
E)   92.4 kgF) A) and E)
G) A) and B)

Question 16

According to the following balanced reaction,how many moles of KO are required to exactly react with 4.33 moles of H2O?
4 KO(s) + 2 H2O(l) → 4 KOH(s) + O2(g)

Accepted Answer

A)   4.33 moles H2O
B)   8.66 moles H2O
C)   17.3 moles H2O
D)   2.17 moles H2O
E)   1.08 moles H2OF) All of the above
G) B) and E)

Question 17

Which of the following represents a chemical property of hydrogen gas?

Accepted Answer

A)   It is gaseous at room temperature.
B)   It is less dense than air.
C)   It reacts explosively with oxygen.
D)   It is colorless.
E)   It is tasteless.F) D) and E)
G) B) and E)

Question 18

If the percent yield for the following reaction is 75.0%,and 25.0 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)   17.1 g
B)   22.8 g
C)   30.4 g
D)   38.5 gE) None of the above
F) A) and D)

Question 19

When silver nitrate reacts with barium chloride,silver chloride and barium nitrate are formed.How many grams of silver chloride are formed when 10.2 g of silver nitrate reacts with 15.0 g of barium chloride?

Accepted Answer

A)   8.61 g
B)   9.40 g
C)   12.1 g
D)   18.8 gE) B) and C)
F) A) and D)

Question 20

What is one of the products of a combustion reaction?

Accepted Answer

A)   graphite
B)   hydrogen
C)   oxygen
D)   heat
E)   ethanolF) B) and E)
G) A) and B)

Exam 8: Chemical Reactions and Chemical Quantities

Define a limiting reagent.

Correct AnswerverifiedA limiting reagent is a reacta...View AnswerShow Answer

Two samples of potassium iodide are decomposed into their constituent elements.The first sample produced 13.0 g of potassium and 42.3 g of iodine.If the second sample produced 24.4 kg of potassium,how many kg of iodine were produced?

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All of the following are examples of chemical properties EXCEPT

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Aluminum metal reacts with aqueous iron( III) oxide to form aqueous aluminum oxide and iron metal.What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest,whole-number stoichiometric coefficients?

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When silver nitrate reacts with barium chloride,silver chloride and barium nitrate are formed.How many grams of silver chloride are formed when 10.2 g of silver nitrate reacts with 15.0 g of barium chloride?

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Which of the following represents a chemical property of hydrogen gas?

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According to the following balanced reaction,how many moles of KO are required to exactly react with 4.33 moles of H2O? 4 KO(s) + 2 H2O(l) → 4 KOH(s) + O2(g)

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If the percent yield for the following reaction is 75.0%,and 25.0 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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Consider the following balanced reaction.What mass (in g) of CO2 can be formed from 288 mg of O2? Assume that there is excess C3H7SH present. C3H7SH(l) + 6 O2(g) → 3 CO2(g) + SO2(g) + 4 H2O(g)

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Global warming is thought to be caused by the increase of one particular gas.Name the gas.

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When 14.0 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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Which substance is the limiting reactant when 8.0 g of sulfur reacts with 12 g of oxygen and 16 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 one of the products of a combustion reaction?

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How many molecules of H2S are required to form 79.0 g of sulfur according to the following reaction? Assume excess SO2. 2 H2S(g) + SO2(g) → 3 S(s) + 2H2O(l)

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What is the percent yield of C2H2 if 62.80g of water yields 15.38g of C2H2 using the following equation. CaC2(s) + 2 H2O(l) → Ca(OH) 2(aq) + C2H2(g)

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Determine the theoretical yield of HCl if 60.0 g of BCl3 and 37.5 g of H2O are reacted according to the following balanced reaction.A possibly useful molar mass is BCl3 = 117.16 g/mol. BCl3(g) + 3 H2O(l) → H3BO3(s) + 3 HCl(g)

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A 12.39 g sample of phosphorus reacts with 42.54 g of chlorine to form only phosphorus trichloride (PCl3) .If it is the only product,what mass of PCl3 is formed?

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Balance the following equation. ________ C9H20 + ________ O2 → ________ H2O + ________ CO2

Correct AnswerverifiedC9H20 + 14 O2 →...View AnswerShow Answer

Balance the following equation. ________ C10H12 + ________ O2 → ________ H2O + ________ CO2

Correct AnswerverifiedC10H12 + 13 O2 →...View AnswerShow Answer

How many moles of BCl3 are needed to produce 5.00 g of HCl(aq) in the following reaction? BCl3(g) + 3 H2O(l) → 3 HCl(aq) + B(OH) 3(aq)

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A limiting reagent is a reacta...
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According to the following balanced reaction,how many moles of KO are required to exactly react with 4.33 moles of H₂O? 4 KO(s) + 2 H₂O(l) → 4 KOH(s) + O₂(g)

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If the percent yield for the following reaction is 75.0%,and 25.0 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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Consider the following balanced reaction.What mass (in g) of CO₂ can be formed from 288 mg of O₂? Assume that there is excess C₃H₇SH present. C₃H₇SH(l) + 6 O₂(g) → 3 CO₂(g) + SO₂(g) + 4 H₂O(g)

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When 14.0 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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Which substance is the limiting reactant when 8.0 g of sulfur reacts with 12 g of oxygen and 16 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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How many molecules of H₂S are required to form 79.0 g of sulfur according to the following reaction? Assume excess SO₂. 2 H₂S(g) + SO₂(g) → 3 S(s) + 2H₂O(l)

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What is the percent yield of C₂H₂ if 62.80g of water yields 15.38g of C₂H₂ using the following equation. CaC₂(s) + 2 H₂O(l) → Ca(OH) ₂(aq) + C₂H₂(g)

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Determine the theoretical yield of HCl if 60.0 g of BCl₃and 37.5 g of H₂O are reacted according to the following balanced reaction.A possibly useful molar mass is BCl₃ = 117.16 g/mol. BCl₃(g) + 3 H₂O(l) → H₃BO₃(s) + 3 HCl(g)

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A 12.39 g sample of phosphorus reacts with 42.54 g of chlorine to form only phosphorus trichloride (PCl₃) .If it is the only product,what mass of PCl₃ is formed?

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Balance the following equation. C₉H₂₀+ O₂→ H₂O + CO₂

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C₉H₂₀ + 14 O₂→...
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Balance the following equation. C₁₀H₁₂ + O₂→ H₂O + CO₂

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C₁₀H₁₂ + 13 O₂→...
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How many moles of BCl₃ are needed to produce 5.00 g of HCl(aq) in the following reaction? BCl₃(g) + 3 H₂O(l) → 3 HCl(aq) + B(OH) ₃(aq)

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