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A cylinder with fixed capacity of 67.2 l...

A cylinder with fixed capacity of 67.2 lit contains helium gas at STP. The amount of heat (in joule) needed to raise the temperature of the gas by `20^(@)C` is
[Given that `R=8.31J"mol"^(-1)K^(-1)`]

A

748 J

B

374 J

C

700 J

D

350 J

Text Solution

Verified by Experts

The correct Answer is:
A
Number of moles of He at STP = `(67.2)/(22.4)=3`
As the volume is constant `rarr` Isochoric process
`Q=nC_V DeltaT = 3xx(3R)/2xx20`
`= 90 R = 90xx8.31 = 748 J`
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