WorksheetsPercent composition
Total questions: 9
Worksheet time: 18mins
Name
Class
Date
1.
What percentage of the total atomic mass of carbon monoxide (CO) is composed of carbon?
a)
29%
b)
43%
c)
57%
d)
73%
2.
What percentage of the total atomic mass of carbon monoxide (CO) is composed of oxygen?
a)
29%
b)
43%
c)
57%
d)
73%
3.
What percentage of the total atomic mass of magnesium bromide (MgBr2) is composed of magnesium?
a)
13%
b)
43%
c)
63%
d)
87%
4.
Lithium phosphide (three lithium atoms with one phosphorus atom) has a chemical formula of Li3P. If you look at the total atomic mass of Li3P, does lithium or phosphorus make up more of the mass?
a)
lithium
b)
phosphorus
c)
they are exactly the same
d)
it is impossible to tell
5.
What percentage of the total atomic mass of lithium phosphide (Li3P) is composed of phosphorus?
a)
13%
b)
29%
c)
40%
d)
60%
6.
What is the percent by mass of oxygen in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
7.
What is the percent by mass of magnesium in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
8.
What is the percent by mass of sodium in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
9.
What is the percent by mass of chlorine in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
100 %
