1.

What is the final enthalpy of the solution made by mixing 100 grams of 10% NaOH having enthalpy 40 J with 300 grams of 90% NaOH having enthalpy 20 J?(a) 10 J(b) 15 J(c) 25 J(d) 40 J

Answer» Correct answer is (c) 25 J

The explanation is: Final enthalpy = 0.25*40 + 0.75*20 = 10 + 15 = 25 J.


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