A gas sample in a piston assembly expands, doing 516 kJ ofwork on its surroundin

Question

A gas sample in a piston assembly expands, doing 516 kJ ofwork on its surroundings at the same time that 368 kJ heat is addedto the gas. What is the change in internal energy of the gasduring the process? Answer in units of kJ. Also, will the pressure of the gas be higher or lower whenthese changes are completed? A gas sample in a piston assembly expands, doing 516 kJ ofwork on its surroundings at the same time that 368 kJ heat is addedto the gas. What is the change in internal energy of the gasduring the process? Answer in units of kJ. Also, will the pressure of the gas be higher or lower whenthese changes are completed?

Explanation / Answer

work done by system W = 516 kJ Heat added to the system Q = 368 kJ From first law of thermodynamics , Q = W + E from this change in internal energy E = Q - W                                                       = -148 kJ

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