Question 1

How many grams of Li3N can be formed from 1.75 moles of Li? Assume an excess of nitrogen.
6 Li(s) + N2(g) → 2 Li3N(s)

Accepted Answer

A)   18.3 g Li3N
B)   20.3 g Li3N
C)   58.3 g Li3N
D)   61.0 g Li3N
E)   15.1 g Li3NF) A) and E)
G) B) and E)

Question 2

Which of the following represents a physical property?

Accepted Answer

A)   Sodium metal is extremely reactive with chlorine gas.
B)   Mercury is a silvery liquid at room temperature.
C)   Aluminum has a tendency to "rust."
D)   Butane is highly flammable.
E)   Argon has an unreactive nature.F) D) and E)
G) B) and E)

Question 3

Consider the following reaction.How many moles of oxygen are required to produce 2.33 moles of water? Assume that there is excess C3H7SH present.
C3H7SH(l) + 6 O2(g) → 3 CO2(g) + SO2(g) + 4 H2O(g)

Accepted Answer

A)   1.55 moles O2
B)   3.50 moles O2
C)   2.33 moles O2
D)   4.14 moles O2
E)   6.21 moles O2F) B) and D)
G) C) and E)

Question 4

Choose the reaction that represents the combustion of C6H12O2.

Accepted Answer

A)   C6H12O2(l)  + 8 O2(g)  → 6 CO2(g)  + 6 H2O(g) 
B)   Mg(s)  + C6H12O2(l)  → MgC6H12O2(aq) 
C)   6 C(s)  + 6 H2(g)  + O2(g)  → C6H12O2(l) 
D)   C6H12O2(l)  → 6 C(s)  + 6 H2(g)  + O2(g) 
E)   None of the above represent the combustion of C6H12O2.F) D) and E)
G) C) and E)

Question 5

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li(s) +  (g) →  N(s) 
How many moles of lithium are needed to produce 0.45 mol of  N when the reaction is carried out in the presence of excess nitrogen?

Accepted Answer

A)   0.23
B)   1.4
C)   0.15
D)   0.30
E)   2.7F) None of the above
G) A) and E)

Question 6

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg(s) +  (g) → 2MgO(s) 
How many moles of  are consumed when 1.90 mol of magnesium burns?

Accepted Answer

A)   0.0782
B)   1.05
C)   1.90
D)   3.80
E)   0.950F) All of the above
G) D) and E)

Question 7

How many moles of CuO can be produced from 2.25 mol of Cu2O in the following reaction?
2 Cu2O(s) + O2(g) → 4 CuO(s)

Accepted Answer

A)   1.12 mol
B)   2.25 mol
C)   4.50 mol
D)   9.00 molE) None of the above
F) All of the above

Question 8

A 14.01 g sample of N2 reacts with 3.02 g of H2 to form ammonia (NH3) .If ammonia is the only product,what mass of ammonia is formed?

Accepted Answer

A)   17.03 g
B)   1.10 g
C)   14.01 g
D)   3.02 g
E)   23.07 gF) B) and C)
G) D) and E)

Question 9

Sodium metal and water react to form hydrogen and sodium hydroxide.If 17.94 g of sodium react with water to form 0.78 g of hydrogen and 31.20 g of sodium hydroxide,what mass of water was involved in the reaction?

Accepted Answer

A)   14.04 g
B)   17.94 g
C)   30.42 g
D)   31.98 gE) A) and B)
F) None of the above

Question 10

Lithium and nitrogen react to produce lithium nitride: 6Li(s) +  (g) →  N(s) 
How many moles of  are needed to react with 0.450 mol of lithium?

Accepted Answer

A)   2.70
B)   0.450
C)   0.150
D)   1.35
E)   0.0750F) A) and B)
G) A) and E)

Question 11

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 12.4 g of carbonic acid?
H2CO3 → H2O + CO2

Accepted Answer

A)   8.80 g
B)   17.5 g
C)   12.4 g
D)   3.60 g
E)   42.7 gF) A) and D)
G) A) and C)

Question 12

Determine the theoretical yield of H2S (in moles) if 16 mol Al2S3 and 16 mol H2O are reacted according to the following balanced reaction.A possibly useful molar mass is Al2S3 = 150.17 g/mol. Al2S3(s) + 6 H2O(l) → 2 Al(OH) 3(s) + 3 H2S(g)

Accepted Answer

A)   48 mol H2S
B)   16 mol H2S
C)   32 mol H2S
D)   24 mol H2S
E)   8.0 mol H2SF) C) and D)
G) None of the above

Question 13

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s) +  O(l) →  (s) 
In a particular experiment,a 5.50-g sample of CaO is reacted with excess water and 6.77 g of  is recovered.What is the percent yield in this experiment?

Accepted Answer

A)   123
B)   1.23
C)   7.91
D)   93.1
E)   81.3F) B) and E)
G) D) and E)

Question 14

How many moles of PCl5 will be produced if .331 moles of P4 is reacted with an excess of Cl2 using the following equation. P4(s) + 10 Cl2(g) → 4 PCl5(g)

Accepted Answer

A)   .331 mol
B)   .662 mol
C)   .993 mol
D)   1.324 mol
E)   1.655 molF) All of the above
G) A) and C)

Question 15

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s) +  O(l) →  (s) 
A 5.00-g sample of CaO is reacted with 4.83 g of  O.How many grams of water remain after the reaction is complete?

Accepted Answer

A)   0.00
B)   0.00991
C)   3.22
D)   1.04
E)   0.179F) C) and D)
G) B) and D)

Question 16

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 D)
F) B) and D)

Question 17

Give the percent yield when 28.16 g of CO2 are formed from the reaction of 4.000 moles of C8H18 with 4.000 moles of O2. 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

Accepted Answer

A)   20.00%
B)   25.00%
C)   50.00%
D)   12.50%E) B) and D)
F) B) and C)

Question 18

How many grams of oxygen are formed when 5.30 moles of KOH are formed?
4 KO(s) + 2 H2O(l) → 4 KOH(s) + O2(g)

Accepted Answer

A)   5.30 g O2
B)   21.2 g O2
C)   42.4 g O2
D)   170 g O2
E)   84.8 g O2F) B) and C)
G) A) and B)

Question 19

Describe the greenhouse effect.

Accepted Answer

Greenhouse gases allow visible...

Question 20

When 8.00 × 1022 molecules of ammonia react with 7.00 × 1022 molecules of oxygen according to the chemical equation shown below,how many grams of nitrogen gas are produced?
4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g)

Accepted Answer

A)   1.86 g
B)   2.17 g
C)   4.88 g
D)   7.44 gE) C) and D)
F) A) and D)

Exam 8: Chemical Reactions and Chemical Quantities

Describe the greenhouse effect.

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Consider the following reaction.How many moles of oxygen are required to produce 2.33 moles of water? Assume that there is excess C3H7SH present. C3H7SH(l) + 6 O2(g) → 3 CO2(g) + SO2(g) + 4 H2O(g)

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Sodium metal and water react to form hydrogen and sodium hydroxide.If 17.94 g of sodium react with water to form 0.78 g of hydrogen and 31.20 g of sodium hydroxide,what mass of water was involved in the reaction?

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How many grams of Li3N can be formed from 1.75 moles of Li? Assume an excess of nitrogen. 6 Li(s) + N2(g) → 2 Li3N(s)

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When 8.00 × 1022 molecules of ammonia react with 7.00 × 1022 molecules of oxygen according to the chemical equation shown below,how many grams of nitrogen gas are produced? 4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g)

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Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg(s) + (g) → 2MgO(s) How many moles of are consumed when 1.90 mol of magnesium burns?

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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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Which of the following represents a physical property?

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Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s) + O(l) → (s) In a particular experiment,a 5.50-g sample of CaO is reacted with excess water and 6.77 g of is recovered.What is the percent yield in this experiment?

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Give the percent yield when 28.16 g of CO2 are formed from the reaction of 4.000 moles of C8H18 with 4.000 moles of O2. 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

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Lithium and nitrogen react to produce lithium nitride: 6Li(s) + (g) → N(s) How many moles of are needed to react with 0.450 mol of lithium?

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Determine the theoretical yield of H2S (in moles) if 16 mol Al2S3 and 16 mol H2O are reacted according to the following balanced reaction.A possibly useful molar mass is Al2S3 = 150.17 g/mol. Al2S3(s) + 6 H2O(l) → 2 Al(OH) 3(s) + 3 H2S(g)

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How many grams of oxygen are formed when 5.30 moles of KOH are formed? 4 KO(s) + 2 H2O(l) → 4 KOH(s) + O2(g)

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Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s) + O(l) → (s) A 5.00-g sample of CaO is reacted with 4.83 g of O.How many grams of water remain after the reaction is complete?

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A 14.01 g sample of N2 reacts with 3.02 g of H2 to form ammonia (NH3) .If ammonia is the only product,what mass of ammonia is formed?

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How many moles of PCl5 will be produced if .331 moles of P4 is reacted with an excess of Cl2 using the following equation. P4(s) + 10 Cl2(g) → 4 PCl5(g)

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Choose the reaction that represents the combustion of C6H12O2.

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Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 12.4 g of carbonic acid? H2CO3 → H2O + CO2

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How many moles of CuO can be produced from 2.25 mol of Cu2O in the following reaction? 2 Cu2O(s) + O2(g) → 4 CuO(s)

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Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li(s) + (g) → N(s) How many moles of lithium are needed to produce 0.45 mol of N when the reaction is carried out in the presence of excess nitrogen?

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Greenhouse gases allow visible...
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Consider the following reaction.How many moles of oxygen are required to produce 2.33 moles of water? Assume that there is excess C₃H₇SH present. C₃H₇SH(l) + 6 O₂(g) → 3 CO₂(g) + SO₂(g) + 4 H₂O(g)

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How many grams of Li₃N can be formed from 1.75 moles of Li? Assume an excess of nitrogen. 6 Li(s) + N₂(g) → 2 Li₃N(s)

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When 8.00 × 10²² molecules of ammonia react with 7.00 × 10²² molecules of oxygen according to the chemical equation shown below,how many grams of nitrogen gas are produced? 4 NH₃(g) + 3 O₂(g) → 2 N₂(g) + 6 H₂O(g)

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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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Give the percent yield when 28.16 g of CO₂ are formed from the reaction of 4.000 moles of C₈H₁₈ with 4.000 moles of O₂. 2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O

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Determine the theoretical yield of H₂S (in moles) if 16 mol Al₂S₃ and 16 mol H₂O are reacted according to the following balanced reaction.A possibly useful molar mass is Al₂S₃= 150.17 g/mol. Al₂S₃(s) + 6 H₂O(l) → 2 Al(OH) ₃(s) + 3 H₂S(g)

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How many grams of oxygen are formed when 5.30 moles of KOH are formed? 4 KO(s) + 2 H₂O(l) → 4 KOH(s) + O₂(g)

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A 14.01 g sample of N₂ reacts with 3.02 g of H₂ to form ammonia (NH₃) .If ammonia is the only product,what mass of ammonia is formed?

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How many moles of PCl₅ will be produced if .331 moles of P₄ is reacted with an excess of Cl₂ using the following equation. P₄(s) + 10 Cl₂(g) → 4 PCl₅(g)

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Choose the reaction that represents the combustion of C₆H₁₂O₂.

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Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 12.4 g of carbonic acid? H₂CO₃ → H₂O + CO₂

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How many moles of CuO can be produced from 2.25 mol of Cu₂O in the following reaction? 2 Cu₂O(s) + O₂(g) → 4 CuO(s)

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