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What is the enthalpy of a mixture having 20% of A with enthalpy 15 J, and 80% of B with enthalpy 25 J?

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What is the enthalpy of a mixture having 20% of A with enthalpy 15 J, and 80% of B with enthalpy 25 J?

(a) 17 J

(b) 19 J

(c) 23 J

(d) 28 J

The question was posed to me by my school teacher while I was bunking the class.

My query is from Heat of Solution, Dissolution and Mixing in portion 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

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Correct option is (c) 23 J

To explain: Heat capacity of mixture = 0.2*15 + 0.8*25 = 23 J.

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