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Physics (12th Grade)

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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) -

    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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