WorksheetsMole Conversions & Percent Composition
Total questions: 7
Worksheet time: 10mins
Name
Class
Date
1.
How many molecules are in 2.5 mol of NaCl?
a)
1.50 x1024 molecules
b)
1.50 molecules
c)
4.15 molecules
d)
1.51 x1024 molecules
2.
How many moles are in 19.82 g Mg?
a)
1.23 mol Mg
b)
481.70 mol Mg
c)
1.00 mol Mg
d)
0.82 mol Mg
3.
How many grams are in 1.2 x 1024 atoms of C?
a)
29.34 grams
b)
23.94 grams
c)
6.02 grams
d)
1.21 grams
4.
What is the percent composition by mass of sulfur (S) in the compound MgSO4?
a)
20.22%
b)
19.85%
c)
26.64%
d)
28.64%
5.
What is the molar mass of PbSO4
a)
303.3 g/mol
b)
294.7g/mol
c)
163.8g/mol
d)
372g/mol
6.
How many hydrogen atoms are in one formula unit of C2H4O2?
a)
2
b)
1
c)
4
d)
6
7.
What is the chemical formula for calcium carbonate?
a)
Ca(CO)3
b)
CaCO3
c)
CaC3
d)
Ca3(OH)
100 %
