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## 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?