BYU ONLINE: CHEMISTRY 043: SPEEDBACK LESSON 1 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATED VERSION 2025/2026

8/12/25, 8:15
PM



BYU ONLINE: CHEMISTRY 043: SPEEDBACK
LESSON 1 EXAM QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS VERIFIED LATEST UPDATED
VERSION 2025/2026



Calculate the molar 55.3 g/mol
mass (molecular
weight) of a sample if a
single molecule weighs
9.19 x 10^-23 g.


6.55 x 10^45 g/mol
9.19 x 10^-23 g/mol
55.3 g/mol
6.02 x 10^23 g/mol
Gallium is a metal that 69.7 g/mol
has a melting point
just above room
temperature but just
lower than body
temperature and literally
melts in your hand when
you pick it up. What is
the correct atomic
weight of gallium?

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, 8/12/25, 8:15
PM



65.4 g/mol
69.7 g/mol
197 g/mol
72.6 g/mol
The relative atomic one atom of carbon-12
mass of an atom can be
found by comparing
the mass of the atom
to the mass of what?


one atom of
carbon-12
one atom of
hydrogen-1
uranium-
235
a proton
Convert 42.7 grams 0.547 mol
Al(OH)3 (molecular
weight 78 g/mol) to
moles.


3.33 x 10^3
mol 0.605
mol
0.547 mol
2.57 x 10^25 mol


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