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  4. Two moles of ideal helium gas is in a rubber balloon at 30° C. The balloon is filled expandable and can be assumed to require no energy in its expansion. The temperature of the gas in the balloon is changed to 350C. The amount of heat required in raising the temperature is nearly (.R=8.3J/mole-k.)

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Q. Two moles of ideal helium gas is in a rubber balloon at $30^\circ C.$ The balloon is filled expandable and can be assumed to require no energy in its expansion. The temperature of the gas in the balloon is changed to $35^{0}C.$ The
amount of heat required in raising the temperature is nearly $\left(\right.R=8.3J/mole-k\left.\right)$

NTA AbhyasNTA Abhyas 2020

Solution:

$Q=nC_{p}d=n\frac{5}{2}RdT=2\times \frac{5}{2}\times 8.3\times 5=208J$