1. A 0.17-mole sample of nitrogen gas occupies a volume of 2.80 L . What is the
ID: 925310 • Letter: 1
Question
1. A 0.17-mole sample of nitrogen gas occupies a volume of 2.80 L . What is the volume of 0.29 mol of nitrogen gas under the same conditions? Express your answer using two significant figures. V=
2. A sample of gas with an initial volume of 32.0 L at a pressure of 760 mmHg and a temperature of 320 K is compressed to a volume of 16.3 L and warmed to a temperature of 445 K . What is the final pressure of the gas? Pfinal =
3.
6. Use the combined gas law to complete the following table (assume the number of moles of gas to be constant): . Complete each column
P1
V1
T1
P2
V2
T2
1.16 atm
1.58 L
11.3 C
1.64 atm
--
32.3 C
718 torr
148 mL
126 K
803 torr
152 mL
--
5.59 atm
0.887 L
23.1 C
--
1.03 L
39.2 C
P1
V1
T1
P2
V2
T2
1.16 atm
1.58 L
11.3 C
1.64 atm
--
32.3 C
718 torr
148 mL
126 K
803 torr
152 mL
--
5.59 atm
0.887 L
23.1 C
--
1.03 L
39.2 C
Explanation / Answer
1. PV = nRT
V2/V1 = n2/n1
with,
V1 = 2.80 L
V2 = ?
n1 = 0.17 mole
n2 = 0.29 mole
we get,
V2 = 0.29 x 2.8/0.17 = 4.78 L
is the new volume
2. moles of gas = 1 atm x 32 L/0.08205 L.atm/K.mol x 320 = 1.22 mols
final pressure of gas = 1.22 x 0.08205 x 445/16.3 = 2.733 atm
3. Table will be completed using PV = nRT
Completed table
P1 V1 T1 P2 V2 T2
1.16 atm 1.58 L 11.3 oC 1.64 atm 1.20 L 32.3 oC
718 torr 148 mL 126 K 803 torr 152 ml 144.72 K
5.59 atm 0.887 L 23.1 oC 5.07 atm 1.03 L 39.2 oC
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