Question 1

Which contains the highest % of hydrogen?

Accepted Answer

A)  HCl
B)  H2SO4
C)  H3PO4
D)  H2OE) C) and D)
F) A) and B)

Question 2

Use the equation NH3 + O2 → NO + H2O to answer the following question(s) .
-If 4 moles nitrogen produces 2 moles nitrogen dioxide, the % yield is ________.

Accepted Answer

A)  100%
B)  50%
C)  25%
D)  12.5%E) B) and D)
F) None of the above

Question 3

Which of the following contains the least number of atoms?

Accepted Answer

A)  1.0 mole C6H14
B)  3.0 moles N2O5
C)  12.0 moles silver
D)  3.0 moles waterE) A) and B)
F) All of the above

Question 4

Which statement is true about the empirical formula?

Accepted Answer

A)  The empirical formula is always different than the molecular formula.
B)  The empirical formula is always the same as the molecular formula.
C)  The empirical formula may be different than the molecular formula.
D)  The empirical formula cannot be determined solely by the % composition.E) B) and D)
F) C) and D)

Question 5

What is the theoretical mass of carbon dioxide produced from four moles of NaHCO3?

Accepted Answer

A)  1 g
B)  22 g
C)  44 g
D)  88 gE) B) and D)
F) All of the above

Question 6

Determine the molecular formula for a compound that has a molar mass of 135 g/mol and is 44.4% C, 51.9% N, and 3.7% H by mass.

Accepted Answer

The answer of Determine the molecular formula for a compound...

Question 7

Which of the following pairs does not share the same molecular mass when rounded to the nearest whole number?

Accepted Answer

A)  CH3OH and oxygen gas
B)  CO and nitrogen gas
C)  C2H6O and C2H4O2
D)  C4H10O and C3H6O2E) All of the above
F) A) and C)

Question 8

What is the mass of sulfur that will react with 0.527 copper metal to yield copper (I) sulfide?

Accepted Answer

A)  0.066 g
B)  0.132 g
C)  0.264 g
D)  0.198 gE) A) and B)
F) A) and C)

Question 9

An iron oxide is 70.0% in iron. Its empirical formula is ________.

Accepted Answer

A)  FeO
B)  Fe2O
C)  Fe2O3
D)  Fe3O4E) C) and D)
F) A) and C)

Question 10

Use the equation NH3 + O2 → NO + H2O to answer the following question(s) .
-What is the mass of NO expected if 104 g of ammonia are consumed in a 100% yield?

Accepted Answer

A)  45 g
B)  90 g
C)  180 g
D)  360 gE) All of the above
F) A) and C)

Question 11

Formaldehyde CH2O and glucose C6H12O6 have the same empirical formula, which happens to be equal to the molecular formula of formaldehyde.

Accepted Answer

A) True 
 B)False

Question 12

One mole of hydrogen gas has 6.02 x 1023 atoms

Accepted Answer

A) True 
 B)False

Question 13

Use the equation NH3 + O2 → NO + H2O to answer the following question(s) .
-The number of moles of chlorine, (Cl atoms) in 12.5 g carbon tetrachloride is ________.

Accepted Answer

A)  0.081
B)  0.162
C)  0.325
D)  0.648E) B) and C)
F) All of the above

Question 14

0.68 g of sulfur combine with 1.51 g of chlorine. The empirical formula of this compound is ________.

Accepted Answer

A)  SCl
B)  SCl2
C)  SCl4
D)  SCl6E) A) and C)
F) A) and B)

Question 15

The molar mass of a compound XClO3 is 106.5. The molar mass (rounded to the nearest whole number) of X is ________, which is ________.

Accepted Answer

A)  39; K
B)  23; Na
C)  7; Li
D)  1; HE) B) and C)
F) B) and D)

Question 16

Use the equation NH3 + O2 → NO + H2O to answer the following question(s) .
-How many moles of aluminum chloride can be obtained from 4.5 moles of aluminum and excess chlorine?

Accepted Answer

A)  1.5
B)  3.0
C)  4.5
D)  6.0E) A) and D)
F) C) and D)

Question 17

Ilmenite (FeTiO3) is the primary ore from which the element titanium (Ti) is isolated. What is the percentage of titanium by mass in this mineral?

Accepted Answer

A)  20%
B)  32%
C)  80%
D)  68%E) B) and D)
F) B) and C)

Question 18

2 C4H10 + 13 O2 → 8 CO2 + 10 H2O
-The reaction was performed in the lab and 50.1 g of CO2 was actually collected. How many grams of the excess reactant are left over?

Accepted Answer

A)  15.7 g
B)  21.8 g
C)  28.0 g
D)  40.6 g
E)  56.3 gF) C) and D)
G) All of the above

Question 19

Use the equation NH3 + O2 → NO + H2O to answer the following question(s) .
-In the equation N2 + 2 O2 → 2 NO2, 14 g of nitrogen will yield ________ g nitrogen dioxide.

Accepted Answer

A)  23
B)  46
C)  92
D)  194E) B) and C)
F) A) and C)

Question 20

Which of the following abides by the principle of mass conservation according to the balanced reaction 4 K + O2 → 2 K2O?

Accepted Answer

A)  39.0g K + 16.0g O2 → 94.0g K2O
B)  156.0 g K + 24.0g O2 → 188.0g K2O
C)  156.0g K + 32.0g O2 → 188.0g K2O
D)  78.0g K + 32.0g O2 → 110.0g K2OE) A) and D)
F) B) and C)

Exam 9: Stoichiometry and the Mole

Formaldehyde CH2O and glucose C6H12O6 have the same empirical formula, which happens to be equal to the molecular formula of formaldehyde.

Correct AnswerverifiedShow Answer

Use the equation NH3 + O2 → NO + H2O to answer the following question(s) . -The number of moles of chlorine, (Cl atoms) in 12.5 g carbon tetrachloride is ________.

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Use the equation NH3 + O2 → NO + H2O to answer the following question(s) . -What is the mass of NO expected if 104 g of ammonia are consumed in a 100% yield?

Correct AnswerverifiedShow Answer

Use the equation NH3 + O2 → NO + H2O to answer the following question(s) . -If 4 moles nitrogen produces 2 moles nitrogen dioxide, the % yield is ________.

Correct AnswerverifiedShow Answer

2 C4H10 + 13 O2 → 8 CO2 + 10 H2O -The reaction was performed in the lab and 50.1 g of CO2 was actually collected. How many grams of the excess reactant are left over?

Correct AnswerverifiedShow Answer

An iron oxide is 70.0% in iron. Its empirical formula is ________.

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Which of the following abides by the principle of mass conservation according to the balanced reaction 4 K + O2 → 2 K2O?

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What is the theoretical mass of carbon dioxide produced from four moles of NaHCO3?

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Use the equation NH3 + O2 → NO + H2O to answer the following question(s) . -In the equation N2 + 2 O2 → 2 NO2, 14 g of nitrogen will yield ________ g nitrogen dioxide.

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Use the equation NH3 + O2 → NO + H2O to answer the following question(s) . -How many moles of aluminum chloride can be obtained from 4.5 moles of aluminum and excess chlorine?

Correct AnswerverifiedShow Answer

Which statement is true about the empirical formula?

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Which of the following pairs does not share the same molecular mass when rounded to the nearest whole number?

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What is the mass of sulfur that will react with 0.527 copper metal to yield copper (I) sulfide?

Correct AnswerverifiedShow Answer

Which of the following contains the least number of atoms?

Correct AnswerverifiedShow Answer

Ilmenite (FeTiO3) is the primary ore from which the element titanium (Ti) is isolated. What is the percentage of titanium by mass in this mineral?

Correct AnswerverifiedShow Answer

0.68 g of sulfur combine with 1.51 g of chlorine. The empirical formula of this compound is ________.

Correct AnswerverifiedShow Answer

One mole of hydrogen gas has 6.02 x 1023 atoms

Correct AnswerverifiedShow Answer

The molar mass of a compound XClO3 is 106.5. The molar mass (rounded to the nearest whole number) of X is ________, which is ________.

Correct AnswerverifiedShow Answer

Determine the molecular formula for a compound that has a molar mass of 135 g/mol and is 44.4% C, 51.9% N, and 3.7% H by mass.

Correct AnswerverifiedShow Answer

Which contains the highest % of hydrogen?

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Formaldehyde CH₂O and glucose C₆H₁₂O₆ have the same empirical formula, which happens to be equal to the molecular formula of formaldehyde.

Correct Answer
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Use the equation NH₃ + O₂ → NO + H₂O to answer the following question(s) . -The number of moles of chlorine, (Cl atoms) in 12.5 g carbon tetrachloride is ________.

Correct Answer
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Use the equation NH₃ + O₂ → NO + H₂O to answer the following question(s) . -What is the mass of NO expected if 104 g of ammonia are consumed in a 100% yield?

Correct Answer
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Use the equation NH₃ + O₂ → NO + H₂O to answer the following question(s) . -If 4 moles nitrogen produces 2 moles nitrogen dioxide, the % yield is ________.

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2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O -The reaction was performed in the lab and 50.1 g of CO₂ was actually collected. How many grams of the excess reactant are left over?

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Which of the following abides by the principle of mass conservation according to the balanced reaction 4 K + O₂ → 2 K₂O?

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What is the theoretical mass of carbon dioxide produced from four moles of NaHCO₃?

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Use the equation NH₃ + O₂ → NO + H₂O to answer the following question(s) . -In the equation N₂ + 2 O₂ → 2 NO₂, 14 g of nitrogen will yield ________ g nitrogen dioxide.

Correct Answer
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Use the equation NH₃ + O₂ → NO + H₂O to answer the following question(s) . -How many moles of aluminum chloride can be obtained from 4.5 moles of aluminum and excess chlorine?

Correct Answer
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Ilmenite (FeTiO₃) is the primary ore from which the element titanium (Ti) is isolated. What is the percentage of titanium by mass in this mineral?

Correct Answer
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One mole of hydrogen gas has 6.02 x 10²³ atoms

Correct Answer
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The molar mass of a compound XClO₃ is 106.5. The molar mass (rounded to the nearest whole number) of X is , which is .

Correct Answer
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