If one mole of a gas occupying y L volume is expanded against a constant external pressure of one atmosphere to a volume of x L, the work done by the system is ______.

Options

A. `- p (x + y) `
B. ` - p (x - y) `
C. `- p (x/y) `
D. `=-p/(x-y)`

Answer

B

Explanation

`W=-P(x-y)L.atm`