During an adiabatic compression of 2 moles of a gas, 100 of work was done. The change in the internal energy will be:

Options

A. 50 J
B. `-100 J`
C. `-50 J`
D. 100 J

Answer

D

Explanation

According to first law of thermodynamics
`dQ =dU + dW`
For adiabatic process `dQ =0" "therefore dU =-dW`
As work is done on the gas `therefore dW =-100 J`.
`therefore dU =-(-100 J) =100 J`.
Thus, correct choice is (d).