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Question

10 g of gas at atmospheric pressure is cooled from 273C to 0C keeping the volume constant; its pressure would become :

A
12atm
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B
1273atm
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C
2 atm
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D
273 atm
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Solution

The correct option is D 12atm
At constant volume, P2P1=T2T1
The initial pressure P1=1 atm

The initial temperature T1=273oC=273+273K=546K.
The final pressure P2=?

The final temperature T2=0oC=273 K.
P21=273546

P2=12 atm

Hence, the correct option is A.

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