An ideal gas at STP is first compressed until its volume is half the initial volume, and then it is allowed to expand until its pressure is half the initial pressure. All of this is done while holding the temperature constant. If the initial internal energy of the gas is U, the final internal energy of the gas will be
A) 2U.
B) U.
C) U/2.
D) U/3.
E) U/4.

Question

Quizplus · Accepted Answer

The internal energy of an ideal gas is a function of temperature only. Since the temperature is held constant throughout the process, the internal energy remains unchanged at U.

An Ideal Gas at STP Is First Compressed Until Its