Question

A piston releases 18 J of heat into its surroundings while expanding from0.0002 m2 to 0.0006 m at a constant pressure of 1.0 * 105 Pa. What are thecorrect values for heat and work for the piston?A. Q = -18 J, W = +40 JB. Q = +18 J, W = +40 JC. Q = +18 J, W = -40 JD. Q = -18 J, W = -40 J

Answer 1

It's important to know that when a system releases heat to the surroundings, the net value of heat is negative by convention, it's exothermic.

On the other hand, when a system does work then the work done is negative, that is, the system is exerting work.

Therefore, the correct answer is D.