Question

What is the enthalpy change of 8 mole solution if the enthalpy change of 5 mole solute is 10 J/mole, and enthalpy of 2 mole solvent is 15 J/mole?

(a) 10 J/mole

(b) 12 J/mole

(c) 13 J/mole

(d) 15 J/mole

This question was posed to me by my college director while I was bunking the class.

This question is from Heat of Solution, Dissolution and Mixing topic in division Energy Balances that Include the Effects of Chemical Reaction, Ideal Processes, Efficiency and the Mechanical Energy Balance and Heats of Solution and Mixing of Basic Chemical Engineering

Answer 1

The correct option is (a) 10 J/mole

Best explanation: ∆Hsolution = ∆Hsolute +∆Hsolvent, => ∆Hsolution = (10*5 + 15*2)/8 = 10 J/mole.