Question

If Cp of steam is 105 J/^oC, what is the enthalpy change of steam from 106^oC to 118^oC?

(a) 420 J

(b) 640 J

(c) 890 J

(d) 1260 J

The question was asked during a job interview.

I want 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) 1260 J

To explain I would say: ∆H = 106∫^118105.dT = 1260 J.