Question

What is the heat transferred from the system if the output sensible heat is 5 J, input sensible heat is 25 J, and heat of solution is 20 J?

(a) 0

(b) 5 J

(c) 10 J

(d) 15 J

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

This is a very interesting question from Effects of Mixing into Energy Balance topic in section 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

Correct choice is (a) 0

For explanation I would say: Q = ∆Hout,sensible – ∆Hin,sensible + ∆Hsolution = 5 – 15 + 20 = 15 J.