1. The problem statement, all variables and given/known data gas is isothermally and reversibly condensed n=2(mol) T=337K H(vap)=35.3kJ/mol find w, q, U, H 2. Relevant equations 3. The attempt at a solution H=-H(vap)*2=-70.6kJ/mol H=U+n(g)RT w=-n(g)RT n(g)=-2 w=5.6kJ So U=H-w U Should be -70.6-5.6=-76.2, but the book gives -65, Where am I wrong? And why is H=q in this process?