Posted by Tulika on Monday, April 9, 2012 at 12:49am.
If it is heated at constant pressure, the volume must increase
heat in = change in internal energy + work out
dQ = dU + dW
P V = n R T
constant pressure
P dV = n R dT = work out
Change in internal energy = n Cv dT = n(5/2)R dT for diatomic gas
total heat required = n R dT + (5/2)n R dT
so our answer is (5/2) / (1+5/2)
= 5/(2+5) = 5/7
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