# Atomic Structure - Average Atomic Mass: Question Preview (ID: 10729)

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Which atom contains exactly 15 protons?
a) P-32
b) S-32
c) O-15
d) N-15

A sample of element X contains 90% X-35 atoms, 8% X-37 atoms, and 2% X-38 atoms. The average isotopic mass is closest to
a) 32
b) 35
c) 37
d) 38

The average isotopic mass of chlorine is 35.5. Which mixture of isotopes (shown as percents) produces this average mass?
a) 50% C-12 and 50% C-13
b) 50% Cl-35 and 50% Cl-37
c) 75% Cl-35 and 25% Cl-37
d) 75% C-12 and 25% C-13

Hydrogen has three isotopes with mass numbers of 1,2, and 3 and has an average atomic mass of 1.00794 amu. This information indicates that
a) equal numbers of each isotope are present
b) more isotopes have an atomic mass of 2 or 3 than of 1
c) more isotopes have an atomic mass of 1 than of 2 or 3
d) isotopes have only an atomic mass of 1

The atomic mass of element A is 63.6 amu. The only naturally occurring isotopes of element A are A-63 and A-65. The percent abundances of Element A are closest to
a) 31% A-63 and 69% A-65
b) 50% A-63 and 50% A-65
c) 69% A-63 and 31% A-65
d) 100% A-63 and 0% A-65

Which value of an element is calculated using both the mass and the relative abundance of each of the naturally occurring isotopes of this element?
a) atomic number
b) atomic mass
c) half-life
d) molar value

A 100 gram sample of naturally occurring boron contains 19.78 % of B-10 and 80.22 % of B-11. Which numerical setup can be used to determine the atomic mass of naturally occurring B
a) (.1978)(10) + (.8022)(11)
b) (.8022)(10) + (.1978)(11)
c) (.1978)(10) / (.8022)(11)
d) (.8022)(10) / (.1978)(11)

What information is necessary to determine the atomic mass of the element chlorine?
a) the atomic mass of each artificially produced isotope of chlorine, only
b) the relative abundance of each naturally occurring isotope of chlorine, only
c) the atomic mass and the relative abundance of each naturally occurring isotope of chlorine
d)

The atomic mass of titanium is 47.88 atomic mass units. This atomic mass represents
a) total mass of all the protons and neutrons in an atom of Ti
b) total mass of all the protons, neutrons, and electrons in an atom of Ti
c) weighted average mass of the most abundant isotope of Ti
d) weighted average mass of all the naturally occurring isotopes of Ti

What is the total number of neutrons in an atom of Fluorine-19?
a) 9
b) 10
c) 19
d) 28

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