External forces have done work 200 MJ, the amount of heat transferred to the gas is 100 MJ.

External forces have done work 200 MJ, the amount of heat transferred to the gas is 100 MJ. How has the internal energy of the gas changed?

According to the law of thermodynamics, how much energy or matter has entered the system, the same amount will remain in it. Therefore, the solution will be as follows:
Internal energy of the gas that he received dU = Q + A;
dU = 100MJ + 200MJ = 300 MJ;
Answer: the internal energy of the gas will change by 300MJ.