Helium in a balloon

Two moles of ideal helium gas are in a rubber balloon at \(30°\) C. The balloon is fully expandable and can be assumed to require no energy in its expansion. The temperature of the gas in the balloon is slowly changed to \(35°\) C. The amount of heat required in raising the temperature is nearly (take \(R = 8.31 J/ \) mol.K)

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