Question

5 J is the latent heat for melting of ice, what is the heat of transition from 0^oC ice to 15^oC water if heat of transition from 0^oC water to 15^oC water is 12 J?

(a) 5 J

(b) 12 J

(c) 15 J

(d) 17 J

I have been asked this question in final exam.

I would like to ask this question from Phase Transitions in section Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes of Basic Chemical Engineering

Answer 1

Right choice is (d) 17 J

The best I can explain: H = 5 + 12 = 17 J.