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## Homework Statement

One mole of an ideal monatomic gas is taken through the cycle ABCA shown schematically

in the diagram. State A has volume 0.0208 m

^{3}and pressure 1.22 × 10

^{5}Pa, and state C has volume 0.0524 m

^{3}Process CA lies along the 305 ±1 K isotherm. The molar heat capacities for the gas are 20.8 J/mol · K and 12.5 J/mol · K.

Determine the heat Q

_{ab }added to the gas during process AB.

Answer in units of J

I have attached an image with the graph. I am not sure if it is necessary. I got the correct answer to the first question (the new temp = 768.365 K)

## Homework Equations

W = p[tex]\Delta[/tex]V

Q = [tex]\Delta[/tex]U + W

## The Attempt at a Solution

I do not know how to calculate the U, which I think I need