Work under constant temperature

[ymehuuh]

Homework Statement

An ideal monatomic gas expands isothermally from 0.590 m3 to 1.25 m3 at a constant temperature of 780 K. If the initial pressure is 1.20x10^5 Pa.
(a) Find the work done on the gas.
(b) Find the thermal energy transfer Q.
(c) Find the change in the internal energy.

Homework Equations

W= -PV
deltaU=Q-W
PfVf/PiVi = Tf/Ti

The Attempt at a Solution

I know I need to find the final pressure...but I'm not sure how to.
Do I use Pf*1.35/1.2x10^5 = 780k?

 

[Andrew Mason]

Homework Statement

An ideal monatomic gas expands isothermally from 0.590 m3 to 1.25 m3 at a constant temperature of 780 K. If the initial pressure is 1.20x10^5 Pa.
(a) Find the work done on the gas.

If T is constant and PV=nRT, what is the relationship between P₁V₁ and P₂V₂? Does that help you to find P₂?

AM