1. The problem statement, all variables and given/known data In an experiment, 1.35 mol of oxygen (02) are heated at constant pressure starting at 11.0°C. How much heat must be added to the gas to double its volume? You may assume without proof, that the molar specific heats are cp=7R/2 and cv=5R/2. 2. Relevant equations 3. The attempt at a solution My working so far... Q=nCpΔT Q=n(7R/2)ΔT Q= 1.35(7R/2)(s-11) -----> where s= Tf But I need some equation linking change in volume to this.... ie Q= -PΔV But I dont Know what P is? Perhaps I need something with ΔEint but im not to sure. I was thinking I will need to solve the first equation simultaneously with one with ΔV I'm stuck as to where to go from here?? Please help any advice is greatly noted.