Question

What is the work done by saturated water which evaporates to 1 kPa atmosphere to form 2 m^3 of water vapor?

(a) -2 kJ

(b) 2 kJ

(c) -1 kJ

(d) 1 kJ

Answer 1

The correct answer is (a) -2 kJ

To explain I would say: Work done = -p∆V = -1*2 = -2 kJ.