How much work (in J) is required to expand the volume of a pump from 0.0 L to 2.7 L against an external pressure of 1.2 atm ?

Answer 1

W=negative Pressure*Change in Volume W=(-P)(delta V)

Answer 2

-pdV gives work in L*atm.
Convert to Joules. 1 L*atm = 101.325 joules.