Question

For the reaction : $H_{2\left(g\right)}+Cl_{2\left(g\right)} \to 2HCl$;
$\Delta H = -44\,kcal$
What is the enthalpy of decomposition of $HCl$ ?

• A. $+ 44 \,kcal/mol$
• B. $- 44\, kcal/mol$
• C. $- 22 \,kcal/mol$
• D. $+22 \,kcal/mol$

Answer 1

Answer: (D)

Enthalpy of decomposition of $HCl$ will be $\frac{44}{2} = 22\,kcal/mol$