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Q.

The Molecular weight of a gas is 40. At 400K if 120 g of this gas has a volume of 20 litres, the pressure of the gas in atm is

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a

4.92

b

5.02

c

49.6

d

0.546

answer is A.

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Detailed Solution

Given

T=400K

V=20L

n=12040=3 moles

P=?

p=nRTV

P=3×0.0821×40020

P=4.92 atm

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The Molecular weight of a gas is 40. At 400K if 120 g of this gas has a volume of 20 litres, the pressure of the gas in atm is