Percent Composition
Authored by Emily Boatwright
Science
10th Grade
NGSS covered
Used 91+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
What percentage of the total atomic mass of carbon monoxide (CO) is composed of carbon?
29%
43%
57%
73%
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
What percentage of the total atomic mass of magnesium bromide (MgBr2) is composed of magnesium?
13%
43%
63%
87%
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
What percentage of the total atomic mass of lithium phosphide (Li3P) is composed of phosphorus?
13%
29%
40%
60%
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
What is the percent by mass of magnesium in MgO?
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
What is the percent by mass of sodium in NaCl?
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?
7.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
What is the percent composition of the elements in Benzene, C6H6?
C = 50%
H = 50%
C = 85.7 %
H = 14.3%
C = 92.2%
H = 7.8%
C = 71.9%
H = 28.1%
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