ThermodynamicsHard

Question

Two moles of ideal helium gas are in a rubber balloon at 30oC. 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 35oC. The amount of heat required in raising the temperature isnearly (take R = 8.31 J/mol.K)

Options

A.62 J
B.104 J
C.124 J
D.208 J

Solution

ᐃQ = nCp ᐃT (Isobaric process)
= 2 × R × (35 - 30)
= 208J

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