A sample of air was compressed to a volume 20.0 L. The temperature was 298.15 K and the pressure was 5.00 x 105 Pa. What

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A sample of air was compressed to a volume 20.0 L. The
temperature was 298.15 K and the pressure was 5.00 x
105 Pa. What amount of gas was in the sample? R =
8.314 J mol-1 K-1.
Hint 1: 1.00 L = 1.00 x
10-3 m3
Select one:
a.
4.03 moles
b.
4.034 moles
c.
4.36 moles
d.
4.040 moles
e.
4.12 moles
f.
4.036 moles
A mixture of cyclopropane gas,
C3H6 (molar mass of
C3H6: 42.08127 gmol-1), and
oxygen, O2 (molar mass of O2: 31.9988
gmol-1), in a 1.00:4.00 mole ratio is used as an
anesthetic. If the mole fraction of C3H6
gas is 0.200 what is the mass of
C3H6 gas present in a 2.50 L bulb at
298.15 K if the total pressure is 1.00 x
105 Pa? R = 8.314 J
mol-1 K-1
Hint 1: Calculate mole of gas first and then the molecular
weight
Hint 2: 1.00 L = 1.00 x
10-3 m3
Select one:
a.
0.867 g
b.
0.850 g
c.
0.8676 g
d.
0.9 g
e.
0.87 g
Convert 1.54 x 1012 Pa into
atmospheres
Select one:
a.
1.520 x 106atm
b.
1.520 x 107 atm
c.
1.51 x 106 atm
d.
1.5199 x 108 atm
e.
1.52 x 107 atm
4.00 moles of air were compressed to a volume 20.0 L.
The temperature was 298.15 K and the pressure was 5.00 x
105 Pa. If the sample of air was collected from air
at a pressure of 2.00 x 105 Pa with a temperature
of 298.15 K, what was the original volume of the gas?
Hint 1: 1.00 L = 1.00 x
10-3 m3
Select one:
a.
5.0 L
b.
50 L
c.
50.0 L
d.
500 L
e.
50. L
A sample of gas is held at constant temperature inside a
cylinder with a volume of 0.60 L when a piston exerts pressure of
1.0 x 105 Pascal. If the external pressure on the
piston is increased to 2.5 x 105 Pascal what will
the new volume be?
Select one:
a.
0.24 L
b.
0.250 L
c.
2.40 L
d.
2.50 L
e.
0.25 L
f.
0.240 L
A 7.00 L tank is charged with 8.50 g of
O2 (molar mass of O2: 31.9988
gmol-1) and 3.50 g of He (molar mass of He: 4.002602
gmol-1). Calculate the mole fraction of
O2.
Select one:
a.
0.224
b.
0.2330
c.
0.22399
d.
0.23299
e.
0.233