Zumdahl Chemistry 9th edition Test Bank (Complete Test Bank with Questions and Answers)

Chemistry 9th Edition By Zumdahl
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Chemistry 9th Edition By Zumdahl – Test Bank
SAMPLE TEST
Chapter 3: Stoichiometry

1. The atomic mass of rhenium is 186.2. Given that 37.1% of natural rhenium is rhenium-185,
what is the other stable isotope?
A)

B)

C)

D)

E)



ANS: B PTS: 1 DIF: Moderate REF: 3.2
KEY: Chemistry | general chemistry | early atomic theory | atomic theory of matter | atomic weight
| mass spectroscopy MSC: Quantitative

,2. Consider the element indium, atomic number 49, atomic mass 114.8 g. The nucleus of an
atom of indium-112 contains
A) 49 protons, 63 neutrons, 49 electrons

B) 49 protons, 49 neutrons

C) 49 protons, 49 alpha particles

D) 49 protons, 63 neutrons

E) 49 protons, 112 neutrons



ANS: D PTS: 1 DIF: Easy REF: 3.2
KEY: Chemistry | general chemistry | early atomic theory | atomic theory of matter | structure of
the atom MSC: Conceptual

3. A hypothetical element consists of two isotopes of masses 69.95 amu and 71.95 amu with
abundances of 25.7% and 74.3%, respectively. What is the average atomic mass of this
element?
A) 70.95 amu

B) 69.95 amu

C) 70.5 amu

D) 71.4 amu

E) 71.95 amu



ANS: D PTS: 1 DIF: Easy REF: 3.2
KEY: Chemistry | general chemistry | early atomic theory | atomic theory of matter | atomic weight
| mass spectroscopy MSC: Quantitative

4. Naturally occurring copper exists in two isotopic forms: 63Cu and 65Cu. The atomic mass of
copper is 63.55 amu. What is the approximate natural abundance of 63Cu?
A) 63%

B) 90%

C) 70%

D) 50%

, E) 30%



ANS: C PTS: 1 DIF: Moderate REF: 3.2
KEY: Chemistry | general chemistry | early atomic theory | atomic theory of matter | atomic weight
| mass spectroscopy MSC: Quantitative

5. Naturally occurring element X exists in three isotopic forms: X-28 (27.977 amu, 92.23%
abundance), X-29 (28.976 amu, 4.67% abundance), and X-30 (29.974 amu, 3.10%
abundance). Calculate the atomic weight of X.
A) 28.09 amu

B) 48.63 amu

C) 27.16 amu

D) 28.97 amu

E) 86.93 amu



ANS: A PTS: 1 DIF: Easy REF: 3.2
KEY: Chemistry | general chemistry | early atomic theory | atomic theory of matter | atomic weight
| mass spectroscopy MSC: Quantitative

6. Naturally occurring element X exists in three isotopic forms: X-28 (27.977 amu, 92.23%
abundance), X-29 (28.976 amu, 4.67% abundance), and X-30 (29.974 amu, 3.10%
abundance). What is the identity of element X?
A) Cu

B) Al

C) Ni

D) Si

E) Sr



ANS: D PTS: 1 DIF: Moderate REF: 3.2
KEY: Chemistry | general chemistry | early atomic theory | atomic theory of matter | atomic weight
| mass spectroscopy MSC: Quantitative

7. The average mass of a carbon atom is 12.011. Assuming you were able to pick up only
one carbon unit, the chances that you would randomly get one with a mass of 12.011 is

, A) 0%

B) 0.011%

C) about 12%

D) 12.011%

E) greater than 50%



ANS: A PTS: 1 DIF: Easy REF: 3.2
KEY: Chemistry | general chemistry | early atomic theory | atomic theory of matter | atomic
weight MSC: Conceptual

8. What is the mass of 4 atom(s) of copper in grams?
A) 254.2 g

B) 2.37 ´ 1021 g

C) 9.57 ´ 10–24 g

D) 6.022 ´ 1023 g

E) 4.22 ´ 10–22 g



ANS: E PTS: 1 DIF: Easy REF: 3.3
KEY: Chemistry | general chemistry | stoichiometry | mass and moles of substance | mole
MSC: Quantitative

9. Iron is biologically important in the transport of oxygen by red blood cells from the lungs to
the various organs of the body. In the blood of an adult human, there are approximately
2.64 ´ 1013 red blood cells with a total of 2.90 g of iron. On the average, how many iron atoms
are present in each red blood cell? (molar mass Fe = 55.85 g/mol)
A) 8.44 ´ 10–10

B) 1.18 ´ 109

C) 3.13 ´ 1022

D) 2.64 ´ 1013

E) 6.14 ´ 10–2