1. The problem statement, all variables and given/known data One mole of copper at a uniform temp. of 0 Celsius is placed in thermal contact with a second mole of copper which, initially, is at a uniform temperature of 100 Celsius. The pressure in the system is maintained at 1 atm. The two moles of copper are thermally insulated from the surroundings. Temperature dependence of the constant pressure heat capacity of solid copper can be described by: Cp = 33.64 + 6.28x10^-3*T J/mol*K a) Calculate the common temperature of the 2 mole system, which is contained in an adiabatic enclosure, when thermal equilibrium is attained. 2. Relevant equations dH = cp*dt dS = dq/T 3. The attempt at a solution Since it is in an adiabatic enclosure, dq = 0. ΔH= H2 - H1 = dq = 0 but in the solution, it says ΔH = H1 + H2 = 0 ∫273Tfcp*dT = - ∫373Tfcp*dT I don't understand why this approach is correct.