What is the heat added to this monatomic ideal gas

[Brit412]

Homework Statement

A monatomic ideal gas expands at a pressure of 110kPa and from a volume of 0.75m^3 to 0.93m^3. Find the amount of heat added to the gas.

Homework Equations

So what I did was:
W= P∆V
and I know ∆U= Q-W
so Q would equal ∆U+W, but how do you know what ∆U equals?

The Attempt at a Solution

 

[krnhseya]

what are you assumptions? that will tell you what delta U is equal to.

 

[Brit412]

If I assume that this is at a constant pressure ∆U= 3/2nR∆T?, but since W=P∆V=nR∆T then ∆U= 3/2W?