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)]

A cylinder witih fixed capacity of 67.2 lit contains helium gas at STP

1.	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)]
Answer» Solution :`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`