300 milimole of perfect gas occupies 13 lit at 320 k ,calculate the work done in joule ,when the gasexpands

Question

A)isothermally against a constant pressure of .20 atm
Isothermal and reversible process
c)Into vaccum until volume of gas is increased by 3 ltr

Answer 1

Note: L is liter.
K is kelvin.

Answer 2

165 joule

Answer 3

i.60.79
ii.165.
iii.0