The reaction of 8.00 g of SO₂ (g) burns in excess oxygen. 9.85 kJ of heat are released. What is D H for the following thermochemical equation?
2 SO₂ (g) + O₂ (g) →2 SO₃ (g)

Question

The reaction of 8.00 g of SO₂ (g) burns in excess oxygen. 9.85 kJ of heat are released. What is D H for the following thermochemical equation? 2 SO₂ (g) + O₂ (g)→2 SO₃ (g)

Quizplus · Accepted Answer

The reaction releases 9.85 kJ for 8.00 g of SO₂. Moles of SO₂ = 8.00 g / 64.07 g/mol = 0.125 mol. For 2 moles of SO₂, ΔH = 9.85 kJ / 0.125 mol * 2 = -157.6 kJ, approximately -1.58×10² kJ.

The Reaction of 8