Three feeds, 10 mole with H = 25 J/mole, 5 mole with H = 10 J/mole and 15 mole with 20 J/mole, what is the enthalpy of the products?

Correct Answer: 20 J/mole
30*H = 10*25 + 5*10 + 15*20, => H = 20 J/mole.