Assuming the water vapour is an ideal gas, the internal energy change (ΔU) in kJ when 1 mole of water is vapourised at 177∘C. (Given molar enthalpy of vapourisation of water 177∘C = 37 kJ/mol and R=253 J/molK)
The enthalpy change for the combustion of ethanol at 298 K and 1 atm is given below
CH3-CH2OH(l) + 3O2(g)------------à 2CO2 (g)+ 3H2O(l) ∆H=-1363Kj.Calculate the internal energy change for the above reaction?