Question 1

Phosphine,an extremely poisonous and highly reactive gas,reacts with oxygen gas to form tetraphosphorus decaoxide and water. PH3(g) + O2(g) → P4O10(s) + H2O(g) [unbalanced]
Calculate the mass of P4O10(s) formed when 225 g of PH3 reacts with excess oxygen.

Accepted Answer

A)  1880 g
B)  940.g
C)  900.g
D)  470.g
E)  56.3 gF) A) and E)
G) All of the above

Question 2

Balance the following equation: Ca3(PO4) 2(s) + SiO2(s) + C(s) → CaSiO3(s) + CO(g) + P4(s)

Accepted Answer

A)  Ca3(PO4) 2(s) + 3SiO2(s) + 8C(s) → 3CaSiO3(s) + 8CO(g) + P4(s) 
B)  Ca3(PO4) 2(s) + 3SiO2(s) + 14C(s) → 3CaSiO3(s) + 14CO(g) + P4(s) 
C)  Ca3(PO4) 2(s) + 3SiO2(s) + 8C(s) → 3CaSiO3(s) + 8CO(g) + 2P4(s) 
D)  2Ca3(PO4) 2(s) + 6SiO2(s) + 10C(s) → 6CaSiO3(s) + 10CO(g) + P4(s) 
E)  2Ca3(PO4) 2(s) + 6SiO2(s) + 10C(s) → 6CaSiO3(s) + 10CO(g) + 4P4(s) F) C) and D)
G) B) and E)

Question 3

Determine the number of ammonia molecules in 4.85 g of ammonia.(NA = 6.022 × 1023 mol-1)

Accepted Answer

A)  2.92 × 1023 molecules
B)  4.73 × 10-25 molecules
C)  1.24 × 1023 molecules
D)  5.83 × 10-24 molecules
E)  1.71 × 1023 moleculesF) All of the above
G) A) and B)

Question 4

Phosphorus pentachloride,a white solid that has a pungent,unpleasant odor,is used as a catalyst for certain organic reactions.Calculate the number of moles in 38.7 g of phosphorus pentachloride.

Accepted Answer

A)  5.38 mol
B)  3.55 mol
C)  0.583 mol
D)  0.282 mol
E)  0.186 molF) A) and B)
G) B) and C)

Question 5

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.)  ___ Cr + ___ H2SO4 → ___ Cr2(SO4) 3 + ___H2

Accepted Answer

A)  4
B)  9
C)  11
D)  13
E)  15F) All of the above
G) None of the above

Question 6

What is the mass,in grams,of one arsenic atom? (NA = 6.022 × 1023 mol-1)

Accepted Answer

A)  5.48 × 10-23 g
B)  33.0 g
C)  74.9 g
D)  1.24 × 10-22 g
E)  8.04 × 1021 gF) A) and D)
G) C) and D)

Question 7

Calculate the formula mass of (NH4) 3AsO4.

Accepted Answer

A)  417.80 amu
B)  193.05 amu
C)  165.02 amu
D)  156.96 amu
E)  108.96 amuF) C) and D)
G) B) and E)

Question 8

The ______________ is the one component that is completely consumed during a chemical reaction.

Accepted Answer

The answer of The ______________ is the one component that...

Question 9

If 31.3 g of manganese(II) chloride,48.3 g of chlorine gas,and 25.7 g of water react to produce manganese(IV) oxide and hydrochloric acid,what is the limiting reactant and what mass of hydrochloric acid is produced?

Accepted Answer

A)  manganese(II) chloride is the limiting reactant and 9.07 g of hydrochloric acid is produced
B)  chlorine is the limiting reactant and 99.3 g of hydrochloric acid is produced
C)  chlorine is the limiting reactant and 24.8 g of hydrochloric acid is produced
D)  manganese(II) chloride is the limiting reactant and 36.3 g of hydrochloric acid is produced
E)  water is the limiting reactant and 52.0 g of hydrochloric acid is producedF) B) and C)
G) A) and C)

Question 10

What mass of nitrogen gas is required to react completely with excess hydrogen gas to produce 13.6 g of ammonia?

Accepted Answer

A)  11.2 g
B)  0.06 g
C)  22.4 g
D)  16.5 g
E)  44.8 gF) B) and E)
G) All of the above

Question 11

What is the name given to the quantitative relationship between the substances that are consumed and produced in a chemical reaction?

Accepted Answer

A)  Law of definite proportions
B)  Law of molecular balance
C)  Percent composition
D)  Stoichiometry
E)  Percent equivalencyF) A) and B)
G) A) and C)

Question 12

What mass of excess reactant remains at the end of the reaction if 90.0 g of SO2 are mixed with 100.0 g of O2? 2SO2 + O2 → 2SO3

Accepted Answer

A)  10.0 g
B)  12.5 g
C)  22.5 g
D)  55.0 g
E)  77.5 gF) B) and C)
G) D) and E)

Question 13

Which could represent the reaction mixture after the complete combustion of acetaldehyde,CH3CHO?

Accepted Answer

A)   3CHO? 
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G) C) and E)

Question 14

Calculate the formula mass of rubidium carbonate,Rb2CO3.

Accepted Answer

A)  340.43 amu
B)  255.00 amu
C)  230.95 amu
D)  145.47 amu
E)  113.48 amuF) B) and C)
G) B) and E)

Question 15

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.)  ___ Al + ___ H2SO4 → ___ Al2(SO4) 3 + ___ H2

Accepted Answer

A)  3
B)  5
C)  6
D)  9
E)  12F) B) and E)
G) B) and D)

Question 16

The empirical formula of C6H6 is CH.

Accepted Answer

A) True 
 B)False

Question 17

Suppose white atoms (W) and black atoms (B) react according to the following balanced chemical equation. 2W + B → BW2
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Accepted Answer

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G) A) and B)

Question 18

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor as follows: 4NH3 + 5O2 → __________4NO + 6H2O
What is the maximum amount of water that may be produced if 40.0 g NH3 and 50.0 g O2 are mixed and allowed to react?

Accepted Answer

A)  1.56mol
B)  1.88 mol
C)  3.52 mol
D)  3.91 mol
E)  2.35 molF) All of the above
G) A) and B)

Question 19

What mass of nitrogen gas is required to react completely with 2.79 g of hydrogen gas to produce ammonia?

Accepted Answer

A)  25.8 g
B)  12.9 g
C)  78.2 g
D)  38.7 g
E)  77.4 gF) A) and D)
G) B) and D)

Question 20

Calculate the molar mass of Ca(BO2) 2·6H2O.

Accepted Answer

A)  273.87 g/mol
B)  233.80 g/mol
C)  183.79 g/mol
D)  174.89 g/mol
E)  143.71 g/molF) B) and C)
G) B) and E)

Exam 3: Stoichiometry Ratios of Combination

If 31.3 g of manganese(II) chloride,48.3 g of chlorine gas,and 25.7 g of water react to produce manganese(IV) oxide and hydrochloric acid,what is the limiting reactant and what mass of hydrochloric acid is produced?

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Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor as follows: 4NH3 + 5O2 → __________4NO + 6H2O What is the maximum amount of water that may be produced if 40.0 g NH3 and 50.0 g O2 are mixed and allowed to react?

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What mass of excess reactant remains at the end of the reaction if 90.0 g of SO2 are mixed with 100.0 g of O2? 2SO2 + O2 → 2SO3

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Which could represent the reaction mixture after the complete combustion of acetaldehyde,CH3CHO?

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Calculate the formula mass of (NH4) 3AsO4.

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What is the mass,in grams,of one arsenic atom? (NA = 6.022 × 1023 mol-1)

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What mass of nitrogen gas is required to react completely with excess hydrogen gas to produce 13.6 g of ammonia?

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Calculate the molar mass of Ca(BO2) 2·6H2O.

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What mass of nitrogen gas is required to react completely with 2.79 g of hydrogen gas to produce ammonia?

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Suppose white atoms (W) and black atoms (B) react according to the following balanced chemical equation. 2W + B → BW2 If the initial reaction mixture is prepared as follows,what will the final reaction mixture be once the reaction is complete?

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Determine the number of ammonia molecules in 4.85 g of ammonia.(NA = 6.022 × 1023 mol-1)

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Phosphorus pentachloride,a white solid that has a pungent,unpleasant odor,is used as a catalyst for certain organic reactions.Calculate the number of moles in 38.7 g of phosphorus pentachloride.

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Phosphine,an extremely poisonous and highly reactive gas,reacts with oxygen gas to form tetraphosphorus decaoxide and water. PH3(g) + O2(g) → P4O10(s) + H2O(g) [unbalanced] Calculate the mass of P4O10(s) formed when 225 g of PH3 reacts with excess oxygen.

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Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) ___ Al + ___ H2SO4 → ___ Al2(SO4) 3 + ___ H2

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The ______________ is the one component that is completely consumed during a chemical reaction.

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Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) ___ Cr + ___ H2SO4 → ___ Cr2(SO4) 3 + ___H2

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What is the name given to the quantitative relationship between the substances that are consumed and produced in a chemical reaction?

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The empirical formula of C6H6 is CH.

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Balance the following equation: Ca3(PO4) 2(s) + SiO2(s) + C(s) → CaSiO3(s) + CO(g) + P4(s)

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Calculate the formula mass of rubidium carbonate,Rb2CO3.

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Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor as follows: 4NH₃ + 5O₂ → __________4NO + 6H₂O What is the maximum amount of water that may be produced if 40.0 g NH₃ and 50.0 g O₂ are mixed and allowed to react?

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What mass of excess reactant remains at the end of the reaction if 90.0 g of SO2 are mixed with 100.0 g of O2? 2SO₂ + O₂ → 2SO₃

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Which could represent the reaction mixture after the complete combustion of acetaldehyde,CH₃CHO?

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Calculate the formula mass of (NH₄) ₃AsO₄.

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What is the mass,in grams,of one arsenic atom? (N_A = 6.022 × 10²³ mol^-1)

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Calculate the molar mass of Ca(BO₂) ₂·6H₂O.

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Suppose white atoms (W) and black atoms (B) react according to the following balanced chemical equation. 2W + B → BW₂ If the initial reaction mixture is prepared as follows,what will the final reaction mixture be once the reaction is complete?

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Determine the number of ammonia molecules in 4.85 g of ammonia.(N_A = 6.022 × 10²³ mol^-1)

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Phosphine,an extremely poisonous and highly reactive gas,reacts with oxygen gas to form tetraphosphorus decaoxide and water. PH₃(g) + O₂(g) → P₄O₁₀(s) + H₂O(g) [unbalanced] Calculate the mass of P₄O₁₀(s) formed when 225 g of PH₃ reacts with excess oxygen.

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Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) _ Al + _ H₂SO₄ → _ Al₂(SO₄) ₃ + _ H₂

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Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) _ Cr + _ H₂SO₄ → _ Cr₂(SO₄) ₃ + _H₂

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The empirical formula of C₆H₆ is CH.

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Balance the following equation: Ca₃(PO₄) ₂(s) + SiO₂(s) + C(s) → CaSiO₃(s) + CO(g) + P₄(s)

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Calculate the formula mass of rubidium carbonate,Rb₂CO₃.

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