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Two moles of ideal helium gas are in a r...

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`)

A

`62J`

B

`104J`

C

`124J`

D

`208J`

Text Solution

Verified by Experts

The correct Answer is:
D
`DeltaQ = nC_(P) DeltaT =2 ((f)/(2)R+R) DeltaT`
`= 2 [(3)/(2)R+R] xx5 = 2 xx (5)/(2) xx 8,31 xx5 = 208 J`
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