General Chemistry 1 (Stoichiometry) –
ACS Exam Practice Questions, Multiple
Choice with Answers
Introduction:
This document contains a comprehensive set of multiple-choice
practice questions focused on stoichiometry concepts in General
Chemistry 1. It covers topics such as mole conversions, limiting
reagents, empirical formulas, percent yield, gas laws, and reaction
stoichiometry.
The material is aligned with ACS-style exam questions and includes
correct answers for self-assessment. It is ideal for exam
preparation and concept reinforcement.
Exam Questions and Answers:
How many atoms are in 1.50 g of Al?
(A) 0.0556 (B) 18.0 (C) 3.35 x 10²²
(D) 2.44 x 10²⁵ ---Correct precise answer---(C) 3.35 x 10²²
A sample of a compound of xenon and fluorine contains molecules
of a single type; XeFn, where n is a whole number. If 9.03 x I0²⁰ of
these XeFn molecules have a mass of 0.311g, what is the value of n?
,(A) 2 (B) 3 (C) 4 (D) 6 ---Correct precise answer---(C) 4
What mass of carbon is present in 1.4 x 10²⁰ molecules of sucrose
(C₁₂H₂₂0₁₁)?
Formula Molar Mass
C₁₂H₂₂O₁₁ 342 g•mol⁻¹
A) 1.7 x 10²¹ g (B) 2.0 x 10²²g
(C) 3.3 x 10⁻² g (D) 2.8 x 10⁻³ g ---Correct precise answer---(C) 3.3
x 10⁻² g
A 2.000 g sample of an unknown metal, M, was completely burned
in excess 0₂ to yield 0.02224 mol of the metal oxide, M₂0₃• What is
the metal?
(A) y (B) Ca (C) Al (D) Sc ---Correct precise answer---(D) Sc
A 3.41 x 10⁻⁶ g sample of a compound is known to contain 4.67 x
10¹⁶ molecules. This compound is
(A) C0₂ (B) CH₄
(C) NH₃ (D) H₂0 ---Correct precise answer---(A) C0₂
, Avogadro's number equals the number of
(A) atoms in one mole of atoms.
(B) molecules in one mole of 02•
(C) marbles in one mole of marbles.
(D) all of the above ---Correct precise answer---(D) all of the above
The number of atoms in 9.0 g of aluminum is the same as the
number of atoms in
(A) 8.1g of magnesium.
(B) 9.0 g of magnesium.
(C) 12.1 g of magnesium.
(D) 18.0 g of magnesium ---Correct precise answer---(A) 8.1g of
magnesium.
A single molecule of a certain compound has a mass of 3.4 x 10⁻²² g.
Which value comes closest to the mass of a mole of this compound?
(A) 50 g•mor⁻¹ (B) 100 g•mo1⁻¹¹
ACS Exam Practice Questions, Multiple
Choice with Answers
Introduction:
This document contains a comprehensive set of multiple-choice
practice questions focused on stoichiometry concepts in General
Chemistry 1. It covers topics such as mole conversions, limiting
reagents, empirical formulas, percent yield, gas laws, and reaction
stoichiometry.
The material is aligned with ACS-style exam questions and includes
correct answers for self-assessment. It is ideal for exam
preparation and concept reinforcement.
Exam Questions and Answers:
How many atoms are in 1.50 g of Al?
(A) 0.0556 (B) 18.0 (C) 3.35 x 10²²
(D) 2.44 x 10²⁵ ---Correct precise answer---(C) 3.35 x 10²²
A sample of a compound of xenon and fluorine contains molecules
of a single type; XeFn, where n is a whole number. If 9.03 x I0²⁰ of
these XeFn molecules have a mass of 0.311g, what is the value of n?
,(A) 2 (B) 3 (C) 4 (D) 6 ---Correct precise answer---(C) 4
What mass of carbon is present in 1.4 x 10²⁰ molecules of sucrose
(C₁₂H₂₂0₁₁)?
Formula Molar Mass
C₁₂H₂₂O₁₁ 342 g•mol⁻¹
A) 1.7 x 10²¹ g (B) 2.0 x 10²²g
(C) 3.3 x 10⁻² g (D) 2.8 x 10⁻³ g ---Correct precise answer---(C) 3.3
x 10⁻² g
A 2.000 g sample of an unknown metal, M, was completely burned
in excess 0₂ to yield 0.02224 mol of the metal oxide, M₂0₃• What is
the metal?
(A) y (B) Ca (C) Al (D) Sc ---Correct precise answer---(D) Sc
A 3.41 x 10⁻⁶ g sample of a compound is known to contain 4.67 x
10¹⁶ molecules. This compound is
(A) C0₂ (B) CH₄
(C) NH₃ (D) H₂0 ---Correct precise answer---(A) C0₂
, Avogadro's number equals the number of
(A) atoms in one mole of atoms.
(B) molecules in one mole of 02•
(C) marbles in one mole of marbles.
(D) all of the above ---Correct precise answer---(D) all of the above
The number of atoms in 9.0 g of aluminum is the same as the
number of atoms in
(A) 8.1g of magnesium.
(B) 9.0 g of magnesium.
(C) 12.1 g of magnesium.
(D) 18.0 g of magnesium ---Correct precise answer---(A) 8.1g of
magnesium.
A single molecule of a certain compound has a mass of 3.4 x 10⁻²² g.
Which value comes closest to the mass of a mole of this compound?
(A) 50 g•mor⁻¹ (B) 100 g•mo1⁻¹¹
