Question

for strong acid base neutralisation energy for 1 mole H2O formation is -57.1KJ. If 0.25 mole of strong monoprotic acid is reacted with 0.5 mole of strong base then enthalpy of neutralisation is

Answer 1

Here the concept that applies is that of Limiting Reactant.

1H+ +1OH- >1H2O and the heat change is -57kJ

if we have 0.25 mole H+ then it will react with 0.25 OH- to produce 0.25mol water.

As the amount of water produced is 1/4 times of 1mole so the heat produced will also be -57.1/4=14.26kJ

Answer 2

Enthalpy of neutralisation-0.25× 57.1 kJ