JEE Advanced 2012 Physics question
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)
Answer: (D)
Solution
The balloon expands freely without energy cost, so the gas stays at atmospheric pressure: the heating is isobaric. For monatomic helium . nC_P$Δ T =
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