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WorksheetsMolar Mass and Percent Composition
Total questions: 15
Worksheet time: 54mins
Name
Class
Date
1.
Find the percentage composition of Mg in Mg3(PO4)2.
a)
27.48% Mg
b)
43.11% Mg
c)
16.00% Mg
d)
12.63% Mg
2.
What is the molar mass of CO2?
a)
12 g/mol
b)
16 g/mol
c)
32 g/mol
d)
44 g/mol
3.
Calculate the molar mass of Ba(C2H3O2)2
a)
255.3 g/mol
b)
237.3 g/mol
c)
228.3 g/mol
d)
196.3 g/mol
4.
What are the units in molar mass?
a)
grams
b)
moles
c)
moles/gram
d)
grams/mole
5.
Which list of number of atoms in Mg(NO3)2 is right?
a)
Mg : 1--NO : 6
b)
Mg : 1-- N : 6--O: 6
c)
Mg : 1-- N: 1-- O: 5
d)
Mg : 1-- N: 2-- O: 6
6.
Calculate the molar mass of Ba(C2H3O2)2
a)
255.3 g/mol
b)
237.3 g/mol
c)
228.3 g/mol
d)
196.3 g/mol
7.
The mass % of H in methane (CH4) is:
a)
75%
b)
92%
c)
25%
d)
4%
e)
6%
8.
Gallium nitride (GaN) is an important material in computer chips. What is the percent composition of gallium in gallium nitride?
a)
83%
b)
17%
c)
100%
d)
0.8327
9.
What is the molar mass of AuCl3?
a)
96 g
b)
130 g
c)
232.5 g
d)
303.3 g
10.
Calculate the molar mass of Cu2O.
a)
37 g/mol
b)
45 g/mol
c)
79.5 g/mol
d)
143 g/mol
11.
Calculate the molar mass of NH4NO2
a)
50 g/mol
b)
60 g/mol
c)
64 g/mol
d)
78 g/mol
12.
What is the percentage of chromium in K2Cr2O7?
a)
38.1%
b)
27.2%
c)
34.7%
d)
100%
13.
What is the molar mass of PbSO4
a)
303.3 g/mol
b)
294.7g/mol
c)
163.8g/mol
d)
372g/mol
14.
What is the molar mass C6H12O6
a)
61.0g/mol
b)
95.7g/mol
c)
180.2 g/mol
d)
164.9g/mol
15.
What is the percent composition by mass of sulfur in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
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