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WorksheetsPercent Composition Ionic Formulas
Total questions: 9
Worksheet time: 27mins
Name
Class
Date
1.
What is the percent by mass of magnesium in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
2.
What is the percent by mass of sodium in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
3.
What is the percent by mass of chlorine in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
4.
What is the percent composition by mass of sulfur in the compound MgSO4 (molar mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
5.
What is the percent composition by mass of magnesium in the compound MgSO4 (molar mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
6.
What is the percent composition by mass of oxygen in the compound MgSO4 (molar mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
7.
What is the percent by mass of oxygen in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
8.
What is the percent by mass of fluorine in CaF2 (molar mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
9.
What is the percent by mass of calcium in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
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