Question

A piston cylinder expands from 7 liter to 15 liter with the external pressure of 500 Pa, what is the work done by the system?

(a) – 1.5 Joule

(b) – 4 Joule

(c) 1.5 Joule

(d) 4 Joule

The question was posed to me in my homework.

My question comes from Energy Types topic in portion Liquids and Gases in Equilibrium with Solids and Energy: Terminology, Concepts, and Units of Basic Chemical Engineering

Answer 1

The correct answer is (b) – 4 Joule

For explanation: Work = 500*(15 – 7) = 4000 mJ = 4 Joule.