# Expanding monotomic gas

We start with 5.00 moles of an ideal monatomic gas with an initial temperature of 127C. The gas expands and, in the process, absorbs an amount of heat equal to 1220 J and does an amount of work equal to 2180 J.

I fouind out the change in U, which is -960. I'm just not sure how to calculate Q. Any help would be greatly appreciated.

OlderDan
Homework Helper
~angel~ said:
We start with 5.00 moles of an ideal monatomic gas with an initial temperature of 127C. The gas expands and, in the process, absorbs an amount of heat equal to 1220 J and does an amount of work equal to 2180 J.

I fouind out the change in U, which is -960. I'm just not sure how to calculate Q. Any help would be greatly appreciated.

I don't understand the question. Why isn't Q the heat absorbed that you were given?

Sorry, I forgot to ask the question (I just copied and pasted it).

The question is:

What is the final temperature T_final of the gas?
Use R = 8.3145 J/mol/K for the ideal gas constant.

Use $Q = \Delta U + W$.

OlderDan