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A cylinder witih fixed capacity of 67.2 ...

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

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`C _(V) = (3//2) R,` No of moles `=n = 67.2//22.4 = 3. Delta Q = n C _(V) dT =3 xx (3//2) xx R xx 30 = 1121.85J`
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