Work of expansion with a piston pushed 10 cm against constant pressure

[tweety1234]

Homework Statement

A chemical reaction takes place in a container of cross-sectional area 100 cm2. The container has a loosely fitting piston at one end. As a result of the reaction, then piston is pushed out by 10 cm against an external pressure of 101.3 kPa. Calculate the work of expansion done by the system.

I really don't know what equation to be using?

 

[tweety1234]

is it

$$W = \int^v_v p dv$$

 

[Redbelly98]

Yes, that's the one. Except the limits should probably be "V1" and "V2".