Posted by **Tulika** on Monday, April 9, 2012 at 12:49am.

When an ideal diatomic gas is heated at constant pressure then what fraction of heat given is used to increase internal energy of gas?

- Physics (12th Grade) -
**Damon**, Monday, April 9, 2012 at 1:12am
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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