[单选题]
An ideal gas at pressxtx5 .n pf dqx+ni.c39 wvu ld2w0g4c0 ty3an/ure $0.8×10^5\,N\,m^{−2}$ undergoes an isobaric compression from $200\,cm^3$ to $50\,cm^3$. Heat energy of $100\,J$ leaves the gas to the surroundings.
What is the change in the internal energy of the gas?
