1. The problem statement, all variables and given/known data The first law of thermodynamics states ΔQ = ΔU + ΔW. What does the ΔQ and the ΔW represent? 2. Relevant equations ΔQ = ΔU + ΔW 3. The attempt at a solution I've never seen the equation set up like this before so I'm a little confused. I said that ΔQ is the heat supplied to the system and ΔW is the work done by the system.