Question

The heat of neutralisation of a strong acid by a strong base is 57.3 KJ mol${}^{-1}$. The heat released when 0.5 mol HNO${}_3$ is mixed with 0.2 mol KOH in aqueous medium is:

• A. 57.3 KJ
• B. 11.46 KJ
• C. 28.65 KJ
• D. 40.11 KJ

Answer 1

Answer: (B)

11.46 KJ

$0.2$ mole of $HN{O}_3$ reacts with $0.2$ mole of KOH

KOH is a limiting reagent
$\therefore$ Heat released $=$ 57.3 x 0.2
$=$ 11.46 KJ

Option B is correct.