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Three moles of an ideal gas are expanded adiabatically. During this process, the temperature of the...

Three moles of an ideal gas are expanded adiabatically. During this process, the temperature of the gas decreases from T= 600K to T= 400K. Find the change in internal energy of gas.

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Answer #1

Moles of ideal gass n = 3

Specific heat ratio for ideal gas = 1.66

Ideal gas constant R = 8.314 J K−1 mol−1

T1 = 600 K, T2 = 400 K

In adiabatic expansion workdone is W = - nR (T1 -T2)/ ( - 1)

                                   W = - 3x8.314(600 - 400)/ (1.66 - 1) = - 7558.182 J

The workdone in adiabatic expansion (-W) = change in internal energy (dU)

dU = 7558.182 J

    

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