[单选题]
An ideal gas at pressv.cb0pftkv we7l/v)63m y;6; web v myurei 68damcfyvuc//1 c/n $0.8×10^5\,N\,m^{−2}$ 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?
