Question

$4$ gm of $NaOH$ is dissolved in water and $4$ gm of $HCl$ is added to this solution. The heat generated in $Kcal$ is:

• A. $13.7$
• B. $1.37$
• C. $137$
• D. $1370$

Answer 1

The correct option is B $1.37$

Moles of $NaOH$ $=\frac{4}{40}=0.100$
Moles of $HCl$ $=\frac{4}{36.5}=0.109$
So, $NaOH$ is a limiting reagent.
$\therefore$ Heat generated is $=+13.7\times 0.1=1.37Kcal$

Option B is correct.