A stationary mass of gas is compressed without friction from an initial state of `0.3m^(2)` and `0.105M` pa to a final state of `0.15m^(3)` and `0.15M` pa. The pressure remaining constant. During the process there is a transfer of `37.6KJ` of heat from the system. During the process the amount of internal energy change is

Options

A. `-28.85KJ`
B. `-21.85KJ`
C. `-21.85MJ`
D. `-15750KJ`

Answer

B

Explanation

`DeltaW=-105xx(0.15-0.3)KJ=+15.75KJ`
`Deltaq=-37.6KJ`
`:. DeltaE=DeltaW+Deltaq=-37.6+15.75=-21.85KJ`