Question

One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure,

The change in internal energy of the gas during the transition is ____________.

Options

• 35 k J

• - 35 k J

• 20 J

• - 20 k J

Answer 1

The change in internal energy of the gas during the transition is - 35 k J.

Explanation:

Change in internal energy,

`Delta "U" = ("P"_2 "V"_2 - "P"_1 "V"_2)/(gamma - 1)`

`= (2 xx 8 - 5 xx 6)/(7/5 -1)    .......(becausegamma = 7/5 "for ideal diatomic gas") = -35  "k J"`