Percent Composition
Authored by Cassandra Riley
Chemistry
10th Grade
NGSS covered
Used 18+ times
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9 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the percent by mass of oxygen in MgO?
20%
40%
50%
60%
Tags
NGSS.HS-PS1-7
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the percent by mass of magnesium in MgO?
20%
40%
50%
60%
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the percent by mass of sodium in NaCl?
39%
61%
35%
65%
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the percent composition by mass of sulfur in the compound MgSO4 (gram formula mass = 120 g/mol)?
20%
27%
46%
53%
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the percent composition by mass of oxygen in the compound MgSO4 (gram formula mass = 120 g/mol)?
20%
27%
46%
53%
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the percent composition of Benzene, C6H6?
C = 50%
H = 50%
H = 50%
C = 85.7 %
H = 14.3%
H = 14.3%
C = 92.2%
H = 7.8%
H = 7.8%
C = 71.9%
H = 28.1%
H = 28.1%
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the molar mass of table salt (NaCl)?
116.886 g/mol
35.453 g/mol
22.990 g/mol
58.443 g/mol
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