The value of ΔH° for the reaction below is -186 kJ. H₂ (g) + Cl₂ (g) → 2HCl (g)
The value of ΔH°_f for HCl (g) is ________ kJ/mol.

Question

The value of ΔH° for the reaction below is -186 kJ. H₂ (g)+ Cl₂ (g)→ 2HCl (g) The value of ΔH°_f for HCl (g)is ________ kJ/mol. A)-3.72 × 10² B)-1.27 × 10² C)-93.0 D)-186 E)+186

Quizplus · Accepted Answer

The given reaction forms 2 moles of HCl gas from its elements, and the ΔH° for the reaction is -186 kJ. Therefore, the ΔH°f for 1 mole of HCl (g) is half of this value, which is -186 kJ / 2 = -93 kJ/mol.

The Value of ΔH° for the Reaction Below Is -186