Question 1

What is the coefficient of H2O when the following equation is properly balanced with smallest set of whole numbers? 
___ Al4C3 + ___ H2O  →\rarr→  ___ Al(OH) 3 + ___ CH4

Accepted Answer

A)  3
B)  4
C)  6
D)  12
E)  24 F) B) and E)
G) None of the above

Question 2

A copper wire has a diameter of 2.00 mm. What length of this wire contains exactly 1.00 mol of copper? (density of Cu = 8.92 g/cm3)

Accepted Answer

A)  0.178 m
B)  0.567 m
C)  180 m
D)  45.1 m
E)  2.27 mF) A) and B)
G) All of the above

Question 3

How many moles of iron are present in an iron cylinder that weighs 25 g?

Accepted Answer

The answer of How many moles of iron are present...

Question 4

Solid sodium hydrogen carbonate (also known as sodium bicarbonate) can be decomposed to form solid sodium carbonate, gaseous carbon dioxide, and water vapor. When the balanced chemical reaction for this process is written such that the coefficient of water is 1, what is the coefficient of carbon dioxide?

Accepted Answer

A)  0
B)  1
C)  2
D)   
E)  cannot be determinedF) A) and C)
G) A) and B)

Question 5

Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Do not forget to count coefficients of one. The sum of the coefficients is __ SF4 + __ H2O  →\rarr→  __ H2SO3 + __ HF

Accepted Answer

A)  4.
B)  6.
C)  7.
D)  9.
E)  none of these. F) A) and B)
G) C) and D)

Question 6

How many grams of sulfur are there in 6.0 g of Fe2(SO4) 3?

Accepted Answer

A)  2.40 g
B)  0.48 g
C)  6.00 g
D)  0.92 g
E)  1.44 gF) A) and B)
G) B) and E)

Question 7

What percent by mass of oxygen is present in carbon monoxide, CO?

Accepted Answer

The answer of What percent by mass of oxygen is...

Question 8

How many sodium atoms are there in 6.0 g of Na3N?

Accepted Answer

A)  3.6 * 1024 atoms
B)  4.6 * 1022 atoms
C)  1.3 * 1023 atoms
D)  0.217 atoms
E)  0.072 atomsF) D) and E)
G) C) and D)

Question 9

How many atoms are in 5.54 g of F2?

Accepted Answer

A)  6.02 * 1023 atoms
B)  0.146 atoms
C)  0.292 atoms
D)  8.78 * 1022 atoms
E)  1.76 * 1023 atomsF) B) and E)
G) C) and E)

Question 10

Calculate the molecular mass, in g/mol, of P4O10.

Accepted Answer

Question 11

Formaldehyde has the formula CH2O. How many molecules are there in 0.11 g of formaldehyde?

Accepted Answer

A)  6.1 * 10 -27
B)  3.7 * 10 -3
C)  4
D)  2.2 * 1021
E)  6.6 * 1022F) A) and D)
G) A) and C)

Question 12

What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr2O3 with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr2O3  →\rarr→ Al2O3 + 2Cr

Accepted Answer

A)  7.7 g
B)  15.4 g
C)  27.3 g
D)  30.8 g
E)  49.9 g F) A) and E)
G) A) and B)

Question 13

How many grams of silver nitrate are necessary to react completely with 7.000 moles of copper?
Cu + 2 AgNO3 $\rarr$ Cu(NO3 )2 + 2 Ag

Accepted Answer

Question 14

A chemistry student determined the empirical formula for tungsten oxide (WxOy). To do so, he heated tungsten with oxygen in a crucible. The data that he recorded are shown below:
Weight of crucible 11.120 g
Weight of tungsten 8.820 g
Weight of crucible and product 22.998 g
What is the empirical formula of tungsten oxide?

Accepted Answer

Question 15

What mass of sodium nitrate would be produced from the complete reaction of 1.00 mol of lead nitrate?
2 NaCl + Pb(NO3 )2 $\rarr$ 2 NaNO3 + PbCl2

Accepted Answer

Question 16

Calculate the mass of 3.7 moles of Br2.

Accepted Answer

Question 17

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers?
 ___ Na + ___ H2O  →\rarr→  ___ NaOH + ___ H2

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5 F) B) and D)
G) B) and C)

Question 18

How many grams of water could be made from 5.0 mol H2 and 3.0 mol O2?

Accepted Answer

A)  90. g
B)  36 g
C)  42 g
D)  45 g
E)  108 gF) B) and D)
G) C) and E)

Question 19

What is the theoretical yield of PI3 if 48.0 g of I2 are reacted with an excess of phosphorus according to the following chemical equation?
2P(s)+ 3I2(s) $\rarr$2PI3(s)

Accepted Answer

Question 20

The percent composition by mass of a compound is 76.0% C, 12.8% H, and 11.2% O. The molar mass of this compound is 284.5 g/mol. What is the molecular formula of the compound?

Accepted Answer

A)  C10H6O
B)  C9H18O
C)  C16H28O4
D)  C20H12O2
E)  C18H36O2F) A) and B)
G) B) and C)

Exam 3: Stoichiometry

Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Do not forget to count coefficients of one. The sum of the coefficients is SF₄ + H₂O $\rarr$ H₂SO₃ + HF

Correct Answer
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Formaldehyde has the formula CH₂O. How many molecules are there in 0.11 g of formaldehyde?

Correct Answer
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How many sodium atoms are there in 6.0 g of Na₃N?

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How many atoms are in 5.54 g of F₂?

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Calculate the molecular mass, in g/mol, of P₄O₁₀.

Correct Answer
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What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? _ Na + _ H₂O $\rarr$ _ NaOH + _ H₂

Correct Answer
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What percent by mass of oxygen is present in carbon monoxide, CO?

Correct Answer
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Calculate the mass of 3.7 moles of Br₂.

Correct Answer
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How many moles of iron are present in an iron cylinder that weighs 25 g?

Correct Answer
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How many grams of sulfur are there in 6.0 g of Fe₂(SO₄) ₃?

Correct Answer
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A copper wire has a diameter of 2.00 mm. What length of this wire contains exactly 1.00 mol of copper? (density of Cu = 8.92 g/cm³)

Correct Answer
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What mass of sodium nitrate would be produced from the complete reaction of 1.00 mol of lead nitrate? 2 NaCl + Pb(NO₃)₂ $\rarr$ 2 NaNO₃ + PbCl₂

Correct Answer
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Correct Answer
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What is the coefficient of H₂O when the following equation is properly balanced with smallest set of whole numbers? _ Al₄C₃ + _ H₂O $\rarr$ _ Al(OH) ₃ + _ CH₄

Correct Answer
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Correct Answer
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The percent composition by mass of a compound is 76.0% C, 12.8% H, and 11.2% O. The molar mass of this compound is 284.5 g/mol. What is the molecular formula of the compound?

Correct Answer
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What is the theoretical yield of PI₃ if 48.0 g of I₂ are reacted with an excess of phosphorus according to the following chemical equation? 2P(s)+ 3I₂(s) $\rarr$ 2PI₃(s)

Correct Answer
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How many grams of silver nitrate are necessary to react completely with 7.000 moles of copper? Cu + 2 AgNO₃ $\rarr$ Cu(NO₃)₂ + 2 Ag

Correct Answer
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What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr₂O₃ with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr₂O₃ $\rarr$ Al₂O₃ + 2Cr

Correct Answer
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How many grams of water could be made from 5.0 mol H₂ and 3.0 mol O₂?

Correct Answer
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Exam 3: Stoichiometry

Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Do not forget to count coefficients of one. The sum of the coefficients is __ SF4 + __ H2O →\rarr→ __ H2SO3 + __ HF

Correct AnswerverifiedShow Answer

Formaldehyde has the formula CH2O. How many molecules are there in 0.11 g of formaldehyde?

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How many sodium atoms are there in 6.0 g of Na3N?

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How many atoms are in 5.54 g of F2?

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Calculate the molecular mass, in g/mol, of P4O10.

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What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ___ Na + ___ H2O →\rarr→ ___ NaOH + ___ H2

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What percent by mass of oxygen is present in carbon monoxide, CO?

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Calculate the mass of 3.7 moles of Br2.

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How many moles of iron are present in an iron cylinder that weighs 25 g?

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How many grams of sulfur are there in 6.0 g of Fe2(SO4) 3?

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A copper wire has a diameter of 2.00 mm. What length of this wire contains exactly 1.00 mol of copper? (density of Cu = 8.92 g/cm3)

Correct AnswerverifiedShow Answer

What mass of sodium nitrate would be produced from the complete reaction of 1.00 mol of lead nitrate? 2 NaCl + Pb(NO3 )2 →\rarr→ 2 NaNO3 + PbCl2

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the coefficient of H2O when the following equation is properly balanced with smallest set of whole numbers? ___ Al4C3 + ___ H2O →\rarr→ ___ Al(OH) 3 + ___ CH4

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The percent composition by mass of a compound is 76.0% C, 12.8% H, and 11.2% O. The molar mass of this compound is 284.5 g/mol. What is the molecular formula of the compound?

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What is the theoretical yield of PI3 if 48.0 g of I2 are reacted with an excess of phosphorus according to the following chemical equation? 2P(s)+ 3I2(s) →\rarr→ 2PI3(s)

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How many grams of silver nitrate are necessary to react completely with 7.000 moles of copper? Cu + 2 AgNO3 →\rarr→ Cu(NO3 )2 + 2 Ag

Correct AnswerverifiedShow Answer

What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr2O3 with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr2O3 →\rarr→ Al2O3 + 2Cr

Correct AnswerverifiedShow Answer

How many grams of water could be made from 5.0 mol H2 and 3.0 mol O2?

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Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Do not forget to count coefficients of one. The sum of the coefficients is SF₄ + H₂O $\rarr$ H₂SO₃ + HF

Correct Answer
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Formaldehyde has the formula CH₂O. How many molecules are there in 0.11 g of formaldehyde?

Correct Answer
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How many sodium atoms are there in 6.0 g of Na₃N?

Correct Answer
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How many atoms are in 5.54 g of F₂?

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Calculate the molecular mass, in g/mol, of P₄O₁₀.

Correct Answer
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What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? _ Na + _ H₂O $\rarr$ _ NaOH + _ H₂

Correct Answer
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Correct Answer
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Calculate the mass of 3.7 moles of Br₂.

Correct Answer
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Correct Answer
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How many grams of sulfur are there in 6.0 g of Fe₂(SO₄) ₃?

Correct Answer
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A copper wire has a diameter of 2.00 mm. What length of this wire contains exactly 1.00 mol of copper? (density of Cu = 8.92 g/cm³)

Correct Answer
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What mass of sodium nitrate would be produced from the complete reaction of 1.00 mol of lead nitrate? 2 NaCl + Pb(NO₃)₂ $\rarr$ 2 NaNO₃ + PbCl₂

Correct Answer
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Correct Answer
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What is the coefficient of H₂O when the following equation is properly balanced with smallest set of whole numbers? _ Al₄C₃ + _ H₂O $\rarr$ _ Al(OH) ₃ + _ CH₄

Correct Answer
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Correct Answer
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Correct Answer
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What is the theoretical yield of PI₃ if 48.0 g of I₂ are reacted with an excess of phosphorus according to the following chemical equation? 2P(s)+ 3I₂(s) $\rarr$ 2PI₃(s)

Correct Answer
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How many grams of silver nitrate are necessary to react completely with 7.000 moles of copper? Cu + 2 AgNO₃ $\rarr$ Cu(NO₃)₂ + 2 Ag

Correct Answer
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What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr₂O₃ with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr₂O₃ $\rarr$ Al₂O₃ + 2Cr

Correct Answer
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How many grams of water could be made from 5.0 mol H₂ and 3.0 mol O₂?

Correct Answer
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