Question

What is the sensible heat of a reaction if the enthalpy of outputs is 5 J, and enthalpy of inputs is 10 J?

(a) -5 J

(b) 5 J

(c) -10 J

(d) 10 J

The question was posed to me in examination.

Question is taken from Energy Balances Application in Processes 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

Right option is (a) -5 J

To explain I would say: Q = ∆Houtput – ∆Hinput = 5 – 10 = -5J.