Question

If heat of dissociation of $CHC{l}_{2}COOH$ is 0.7 kcal/mol, then $△H$ for the reaction:
$CHC{l}_{2}COOH+KOH\to CHC{l}_{2}COOK+H_{2}O$

• A. - 13 kcal
• B. +13 kcal
• C. -14.4 kcal
• D. -13.7 kcal

Answer 1

The correct option is A - 13 kcal

$H^{+}+O{H}^{-}\to H_{2}O\left(l\right)△H=-13.7kcal$ ...(i)
$CHC{l}_{2}COOH\to CHC{l}_{2}CO{O}^{-}+H^{+}△H=0.7kcal$ ...(ii)
$CHC{l}_{2}COOH+O{H}^{-}\to CHC{l}_{2}CO{O}^{-}+H_{2}O\left(l\right)△H=?$
Adding equation (i) and (ii) $△H=-13kcal.$