1. The problem statement, all variables and given/known data During an isothermal expansion, a confined ideal gas does -150J agaisnt its surroundings. Which of the following describes the heat transfer during this process? A 150J of Heat was added to the gas B 150J of Heat was removed from the gas C 300J of Heat was added to the gas D 300J of Heat was removed from the gas E No heat 2. Relevant equations U = Q + W In isothermal expansion, Q = -W 3. The attempt at a solution For this multiple choice problem, I thought the answer would be B. This is becaise the gas does -150J of work agaisnt its surroundings. This means that the surrounding did 150J of work into the gas. Thus, I would expect that if we Followed Q = -W, that 150J of heat was removed from the gas. However, the answer is (A).