Question 1

How many protons are there in a molecule of adrenaline (C9H13NO3) , a neurotransmitter and hormone?

Accepted Answer

A)   22
B)   26
C)   43
D)   98
E)   183F) A) and C)
G) None of the above

Question 2

How many molecules of molecular oxygen react with four molecules of NH3 to form four molecules of nitrogen monoxide and six molecules of water?

Accepted Answer

A)   2
B)   10
C)   3
D)   4
E)   5F) A) and B)
G) None of the above

Question 3

Which of the following samples contains the greatest total number atoms?

Accepted Answer

A)   50.0 g of Li2O
B)   75.0 g of CaO
C)   200.0 g of Fe2O3
D)   50.0 g of CO2
E)   100.0 g of SO3F) B) and D)
G) A) and D)

Question 4

Constitutional (structural) isomers have the same molecular formula but different structural formulas.

Accepted Answer

A) True 
 B)False

Question 5

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH) 2.

Accepted Answer

A)   3.28 mol
B)   2.32 mol
C)   0.431 mol
D)   0.305 mol
E)   0.200 molF) A) and E)
G) B) and D)

Question 6

Calculate the number of oxygen atoms in 29.34 g of sodium sulfate, Na2SO4.

Accepted Answer

A)   1.244 × 1023 O atoms
B)   4.976 × 1023 O atoms
C)   2.409 × 1024 O atoms
D)   2.915 × 1024 O atoms
E)   1.166 × 1025 O atomsF) A) and E)
G) D) and E)

Question 7

Hydroxylamine hydrochloride is a powerful reducing agent which is used as a polymerization catalyst. It contains 5.80 mass % H, 20.16 mass % N, 23.02 mass % O, and 51.02 mass % Cl. What is its empirical formula?

Accepted Answer

A)   H2N7O8Cl18
B)   H2N2O2Cl
C)   HN3O4Cl9
D)   H4NOCl
E)   H4NOCl2F) A) and D)
G) C) and D)

Question 8

Ammonia will react with fluorine to produce dinitrogen tetrafluoride and hydrogen fluoride (used in production of aluminum, in uranium processing, and in frosting of light bulbs) . 2NH3(g)  + 5F2(g)  → N2F4(g)  + 6HF(g) 
How many moles of NH3 are needed to react completely with 13.6 mol of F2?

Accepted Answer

A)   34.0 mol
B)   27.2 mol
C)   6.80 mol
D)   5.44 mol
E)   2.27 molF) B) and D)
G) A) and C)

Question 9

Calculate the mass in grams of 8.35 × 1022 molecules of CBr4.

Accepted Answer

A)   0.0217 g
B)   0.139 g
C)   7.21 g
D)   12.7 g
E)   46.0 gF) A) and E)
G) All of the above

Question 10

Calculate the molar mass of tetraphosphorus decaoxide, P4O10, a corrosive substance which can be used as a drying agent.

Accepted Answer

A)   469.73 g/mol
B)   283.89 g/mol
C)   190.97 g/mol
D)   139.88 g/mol
E)   94.97 g/molF) A) and B)
G) B) and C)

Exam 3: Stoichiometry of Formulas and Equations

How many protons are there in a molecule of adrenaline (C₉H₁₃NO₃) , a neurotransmitter and hormone?

Correct Answer
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Correct Answer
verified

Calculate the mass in grams of 8.35 × 10²² molecules of CBr₄.

Correct Answer
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How many molecules of molecular oxygen react with four molecules of NH₃ to form four molecules of nitrogen monoxide and six molecules of water?

Correct Answer
verified

Which of the following samples contains the greatest total number atoms?

Correct Answer
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Calculate the molar mass of tetraphosphorus decaoxide, P₄O₁₀, a corrosive substance which can be used as a drying agent.

Correct Answer
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Hydroxylamine hydrochloride is a powerful reducing agent which is used as a polymerization catalyst. It contains 5.80 mass % H, 20.16 mass % N, 23.02 mass % O, and 51.02 mass % Cl. What is its empirical formula?

Correct Answer
verified

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH) ₂.

Correct Answer
verified

Constitutional (structural) isomers have the same molecular formula but different structural formulas.

Correct Answer
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Calculate the number of oxygen atoms in 29.34 g of sodium sulfate, Na₂SO₄.

Correct Answer
verified

Exam 3: Stoichiometry of Formulas and Equations

How many protons are there in a molecule of adrenaline (C9H13NO3) , a neurotransmitter and hormone?

Correct AnswerverifiedShow Answer

Ammonia will react with fluorine to produce dinitrogen tetrafluoride and hydrogen fluoride (used in production of aluminum, in uranium processing, and in frosting of light bulbs) . 2NH3(g) + 5F2(g) → N2F4(g) + 6HF(g) How many moles of NH3 are needed to react completely with 13.6 mol of F2?

Correct AnswerverifiedShow Answer

Calculate the mass in grams of 8.35 × 1022 molecules of CBr4.

Correct AnswerverifiedShow Answer

How many molecules of molecular oxygen react with four molecules of NH3 to form four molecules of nitrogen monoxide and six molecules of water?

Correct AnswerverifiedShow Answer

Which of the following samples contains the greatest total number atoms?

Correct AnswerverifiedShow Answer

Calculate the molar mass of tetraphosphorus decaoxide, P4O10, a corrosive substance which can be used as a drying agent.

Correct AnswerverifiedShow Answer

Hydroxylamine hydrochloride is a powerful reducing agent which is used as a polymerization catalyst. It contains 5.80 mass % H, 20.16 mass % N, 23.02 mass % O, and 51.02 mass % Cl. What is its empirical formula?

Correct AnswerverifiedShow Answer

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH) 2.

Correct AnswerverifiedShow Answer

Constitutional (structural) isomers have the same molecular formula but different structural formulas.

Correct AnswerverifiedShow Answer

Calculate the number of oxygen atoms in 29.34 g of sodium sulfate, Na2SO4.

Correct AnswerverifiedShow Answer

How many protons are there in a molecule of adrenaline (C₉H₁₃NO₃) , a neurotransmitter and hormone?

Correct Answer
verified

Correct Answer
verified

Calculate the mass in grams of 8.35 × 10²² molecules of CBr₄.

Correct Answer
verified

How many molecules of molecular oxygen react with four molecules of NH₃ to form four molecules of nitrogen monoxide and six molecules of water?

Correct Answer
verified

Correct Answer
verified

Calculate the molar mass of tetraphosphorus decaoxide, P₄O₁₀, a corrosive substance which can be used as a drying agent.

Correct Answer
verified

Correct Answer
verified

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH) ₂.

Correct Answer
verified

Correct Answer
verified

Calculate the number of oxygen atoms in 29.34 g of sodium sulfate, Na₂SO₄.

Correct Answer
verified