Question

If the enthalpy of formation o f$HCl\left(g\right)$ and ${Cl}^{-}\left(aq\right)$ are $-92kJ/mole$ and $-167.44kJ/mol$, find the enthalpy of solution of hydrogen chloride gas.

• A. $-75.14kJ/mol$
• B. $+75.14kJ/mol$
• C. $-260.7kJ/mol$
• D. None of these

Answer 1

The correct option is A $-75.14kJ/mol$

Using Hess law,

x=enthalpy of solution for HCl gas

A/Q,

$-92.30+x=-167.44$
$x=-75.14kJ/mol$

Hence, option A is correct