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Question

1/2 mole oxygen gas occupies 44.8 L at temperature 273.15 K. The pressure of the oxygen gas is .

A
0.25 atm
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B
0.5 atm
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C
4 atm
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Solution

The correct option is A 0.25 atm

Given V= 44.8 L, T = 273.15 K, n = 1/2 and R = 0.082 Litre atm K1 mol1

The ideal gas equation is PV = nRT
where P = Pressure,
V = Volume,
n = Number of moles of the gas,
R = Universal gas constant,
T = Temperature

By substituting the given values in the equation we get
P x 44.8 = 1/2 x 0.082 x 273.15
P = 0.25 atm


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