An ideal gas undergoes an adiabatic process while doing 25 J of work. What is the change in the internal (thermal) energy of the gas?
A) 25 J
B) -50 J
C) -25 J
D) 50 J
E) 0 J

Question

Quizplus · Accepted Answer

In an adiabatic process, there is no heat exchange with the surroundings. The work done by the gas results in a decrease in its internal energy. According to the first law of thermodynamics, ΔU = Q - W, where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system. Since Q = 0 for an adiabatic process and W = 25 J, ΔU = 0 - 25 J = -25 J.

An Ideal Gas Undergoes an Adiabatic Process While Doing 25