Question

The heat of neutralisation of a strong acid and a strong alkali is $-57.0kJmo{l}^{-1}$. The heat released when 0.5 mole of $HN{O}_3$ is mixed with 0.2 mole of $KOH$ is:

• A. $-57.0kJ$
• B. $-11.4kJ$
• C. $-28.5kJ$
• D. $-34.9kJ$

Answer 1

The correct option is B $-11.4kJ$

Here, $HN{O}_3$ is a monobasic acid and $KOH$ is a monoacidic base. So, only 0.2 moles of each $HN{O}_3$ and $KOH$ will be neutralized.
Given,
The heat of neutralization for 1 mole is $-57.0kJmo{l}^{-1}$.
So, the heat of neutralization for 0.2 moles will be $-57.0\times 0.2=-11.4kJ$