1. The problem statement, all variables and given/known data Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2114 J of heat are added to the gas, and 811 J of work are done on it. What is the final temperature of the gas? 2. Relevant equations 3. The attempt at a solution I have a feeling I'm missing an equation. I thought the equation was U = Q - W but that won't help me here.