7. Energy, Rate and Equilibrium

Calculate the ∆H_rxn for the following thermochemical equation:

S (s) + $\frac{3}{2}$ O₂ (g) → SO₃ (s) ΔH_rxn = ?

When given the following:

2 S (s) + 3 O₂ (g) → 2 SO₃ (s) ΔH_rxn = −296.8 kJ

Calculate the ∆H_rxn for

S (s) + $\frac32$ O₂ (g) → SO₃ (g) ΔH_rxn = ?

Given the following set of reactions:

$\frac12$ S (s) + $\frac12$ O₂ (g) → $\frac12$ SO₂ (g) ΔH° = −296.8 kJ

2 SO₃ (g) → 2 SO₂ (g) + O₂ (g) ΔH° = 198.4 kJ

Calculate the ∆H_rxn for

ClF (g) + F₂ (g) → ClF₃ (g) ΔH_rxn = ?

Given the following reactions:

Cl₂O (g) + F₂O (g) → 2 ClF (g) + O₂ (g) ΔH° = −167.4 kJ

4 ClF₃ (g) + 4 O₂ (g) → 2 Cl₂O (g) + 6 F₂O (g) ΔH° = 682.8 kJ

2 F₂ (g) + O₂ (g) → 2 F₂O (g) ΔH_rxn = −181.7 kJ