Question

A mixture contains 50% of A with Heat Capacity 10 J/^oC and 50% of B with Heat Capacity 20 J/^oC, what is the Heat Capacity of mixture?

(a) 12 J/^oC

(b) 15 J/^oC

(c) 17 J/^oC

(d) 18 J/^oC

I had been asked this question in an interview for job.

This interesting 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 (b) 15 J/^oC

For explanation I would say: Heat capacity of mixture = 0.5*10 + 0.5*20 = 15 J/^oC.