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Q.

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 J) in raising the temperature is nearly
(take $R = 8.31 J / m o l / K$ )
(Round-off to nearest integer)

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answer is 208.

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Detailed Solution

$\begin{array}{l} \Rightarrow Δ Q = n C_{p} Δ T \\ = \frac{2 \times 5 \times 8.31 \times 5}{2} \\ Δ Q = 207.75 J \end{array}$

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