Chem 065 - Introductory General Chemistry » Winter 2024 » Practice Formula Conversion and Percent Mass Composition
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Question #1
0.358-g sample of chromium reacts completely with oxygen to form 0.523 g of the metal oxide. What is the mass percent of chromium in the metal oxide? Use correct Significant Figure and unit in your answer.
A.
50.86%
B.
68.5%
C.
60.58%
D.
86.1%
Question #2
Acetic acid (HC2H3O2) is the active ingredient in vinegar. Calculate the mass percent composition of C in acetic acid. Use 3 significant figure and correct unit in your answer.
A.
30.0%
B.
60.0%
C.
40.0%
D.
50.0%
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