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Question

10 g of a gas at atmospheric pressure is cooled from 273C to 0C keeping the volume constant. What would be its pressure?

A
1/4 atm
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B
remains same
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C
1/2 atm
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D
2 atm
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Solution

The correct option is C 1/2 atm
Given information:
Initial pressure of the gas P1=1 atm
Initial temperature of the gas T1=273C=546 K
Final temperature of the gas T2=0C=273 K
Final Pressure of the gas P2=?
From Gay Lussac's law, P1T1=P2T2 at constant volume.

1546=P2273

Hence,
P2=12 atm

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