# Change in internal engergy of a monatomic ideal gas

## Homework Statement

A monatomic ideal gas expands from 1.00 meters cubed to 2.50 meters cubed at a constant pressure of 2.00 x 10^5 Pa. Find the change in the internal energy of the gas.

## Homework Equations

$$\Delta$$U = Q + W

## The Attempt at a Solution

Well, I know how to find work, which is -P$$\Delta$$V

But I'm having trouble finding the energy transferred into the system by heat, or Q, because the problem does not give a specific value for it.

I would much appreciate it if someone could give me some pointers as to how to find Q.

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kuruman
Homework Helper
Gold Member
How is Q related the the specific heat at constant pressure?

I don't exactly know, I do know that $$\Delta$$U = 3/2nR$$\Delta$$T for a monatomic gas, where the molar specific heat is given by Cv = 3/2R

kuruman