Given the data in the table below and ΔH°_rxn for the reaction SO₂Cl₂ (g) + 2H₂O (l) → H₂SO₄ (l) + 2HCl (g) ΔH° = -62 kJ
ΔH°_f of HCl (g) is ________ kJ/mol.

Question

Given the data in the table below and ΔH°<sub>rxn</sub> for the reaction SO<sub>2</sub>Cl<sub>2</sub> (g) + 2H<sub>2</sub>O (l) → H<sub>2</sub>SO<sub>4</sub> (l) + 2HCl (g) ΔH° = -62 kJ ΔH°<sub>f</sub> of HCl (g) is ________ kJ/mol. A) -184 B) 60 C) -92 D) 30 E) Insufficient data are given.

Quizplus · Accepted Answer

Using Hess's law, we can determine the ΔH°f of HCl (g) from the given data: ΔH° = ΔH°f(HSOSCl) - ΔH°f(HCl) -62 kJ/mol = (-296 kJ/mol + 0 + 0) - ΔH°f(HCl) ΔH°f(HCl) = -296 kJ/mol + 62 kJ/mol = -234 kJ/mol Since the reaction produces 2 moles of HCl, we divide by 2 to get the ΔH°f of HCl (g): ΔH°_f of HCl (g) = -234 kJ/mol / 2 = -92 kJ/mol

Given the Data in the Table Below and ΔH°rxn for the Reaction

Given the Data in the Table Below and ΔH°_rxn for the Reaction