The work done when 5 moles of an ideal gas expands isothermally from `45 m^3 " to " 55 m^3` against a constant pressure of 100 pascal in J/mol is

Options

A. `-500`
B. `-1000`
C. `-5000`
D. `-200`

Answer

D

Explanation

`w= - P Delta V =- 100 (55 -45) =- 1000 j`
`therefore 5 ` mole of gas, W=- 1000 J
`therefore` 1 mole of gas, `W =- 200 J// mol`