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**Question**:

*When a quantity of monatomic ideal gas expands at a constant pressure of [tex]4.00 \times 10^{4} {\rm Pa}[/tex], the volume of the gas increases from [tex]2.00 \times 10^{ - 3} {\rm m}^{3}[/tex] to [tex]8.00 \times 10^{ - 3} {\rm m}^{3}[/tex].*

**A.**

What is the change in the internal energy of the gas?

It's isobaric, so the pressure is constant.

I know the work is [tex]P\Delta V = (4.00 * 10^4)(6.00 * 10^{-3})[/tex].

But, I don't know how to get [tex]\Delta U[/tex] from this.