Chemistry Reference
In-Depth Information
Chapter 7 Examination
Part I—Multiple Choice
Select the best answer choice for each of the following questions.
1.
How many molecules does 2 moles of water (H
2
O) represent?
a) 6
b) 6.02 × 10
23
c) 1.20 × 10
24
d) 1.81 × 10
24
2.
How many atoms can be found in 1 mole of water (H
2
O) molecules?
a) 3
b) 6.02 × 10
23
c) 1.20 × 10
24
d) 1.81 × 10
24
3.
How many atoms are there in one molecule of propane, C
3
H
8
?
a) 3
b) 11
c) 1.20 × 10
24
d) 6.62 × 10
24
4.
How many atoms of hydrogen are in one molecule of propane, C
3
H
8
?
a) 8
b) 11
c) 1.81 × 10
24
d) 4.82 × 10
24
5.
How many atoms of hydrogen are in one mole of propane, C
3
H
8
?
a) 8
b) 11
c) 1.81 × 10
24
d) 4.82 × 10
24
6.
How many atoms of carbon are there in one mole of propane, C
3
H
8
?
a) 3
b) 11
c) 1.81 × 10
24
d) 4.82 × 10
24
7.
How many atoms of carbon are there in 5 moles of propane, C
3
H
8
?
a) 9.03 × 10
24
b) 3.01 × 10
24
c) 1.81 × 10
24
d) 4.82 × 10
24
8.
How much space would 1.50 moles of neon gas occupy at STP?
a) 22.4 dm
3
b) 30.3 dm
3
c) 33.6 dm
3
d) 44.8 dm
3
9. What is the mass of 2.50 moles of H
2
O?
a) 7.50 g b) 56.0 dm
3
c) 1.51 × 10
24
g d) 45.0 g
10. Which of the following represents 0.500 moles of carbon monoxide
(CO) molecules?
a) 28.0 g
c) 33.6 dm
3
at STP
b) 3.01 × 10
23
molecules
d) 6.02 × 10
23
molecules
Part II—Molar Conversions
Perform the following calculations.
11. How many molecules would 3.45 moles of methane (CH
4
) represent?
12. How much space would 0.0334 moles of argon gas occupy at STP?
13. What would be the mass of 5.43 moles of CO
2
, with a molar mass of
44.0 g/mole?
