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WorksheetsHONORS CHEM The Mole PRE/POST Test
Total questions: 15
Worksheet time: 54mins
Name
Class
Date
1.
What is the empirical formula of the following molecular formula: C3H6
a)
C3H6
b)
CH2
c)
C2H4
d)
CH3
2.
How many molecules in 22g of carbon dioxide?
a)
3.01X1023
b)
6.02X1023
c)
0.5
d)
2
3.
What is the molar mass of Ca(NO3)2?
a)
164.03 g/mole
b)
228.32 g/mole
c)
150.02 g/mole
d)
218.05 g/mole
4.
How many moles are in 225 g of CO?
a)
28.01 mole
b)
4.82 x 1024 mole
c)
6,302,25 mole
d)
8.03 mole
5.
What is the molar mass of Fe?
a)
26 g/mole
b)
55.85 g/mole
c)
56 g/mole
d)
6.02 x 1023 g/mole
6.
How many grams are in 1.5 moles of O?
a)
9.03 x 1023 grams
b)
16 grams
c)
24 grams
d)
6.02 x 1023 grams
7.
How many carbon atoms are in 4.52 moles of carbon?
a)
6.02 x 1023 atoms
b)
1.33 x 1023 atoms
c)
4.52 atoms
d)
2.72 x 1024 atoms
8.
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%
9.
What is the percent by mass of chlorine in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
10.
What are the units in molar mass?
a)
grams
b)
moles
c)
moles/gram
d)
grams/mole
11.
You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements. (keep two decimal places throughout calculations)
a)
SO
b)
SO2
c)
SO3
d)
SO4
12.
A compound came out with the following molar ratio
3 mol Carbon: 1.49 mol Phosphorus: 2 mol Oxygen
What would be the empirical formula?
3 mol Carbon: 1.49 mol Phosphorus: 2 mol Oxygen
What would be the empirical formula?
a)
Ca6P3O4
b)
C3PO2
c)
C6P3O4
d)
C3P3O2
13.
What is the molecular formula if the empirical formula is C2H5 and the molecular molar mass is 58.14 g/mol?
a)
C2H5
b)
C4H10
c)
C1H2.5
d)
C4H8
14.
What is the volume of 5 moles of oxygen gas at STP?
a)
112 L
b)
22.4 L
c)
78.8 L
d)
114.24 L
15.
How many moles are in a 18 L tank of nitrogen gas at STP?
a)
0.9 moles
b)
1 mole
c)
0.8 moles
d)
0.6 moles
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