Given the thermochemical equation:
2 SO₂ (g) + O₂ (g) →2 SO₃ (g) D H = - 197 kJ What is D H for the formation of 8.00 g of SO₃?

Name: Given the thermochemical equation: 2 SO 2 (g) + O 2 (g)→2 SO 3 (g) D H = - 197 kJ What is D H for the formation of 8.00 g of SO 3 ?
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Question

Given the thermochemical equation: 2 SO₂ (g) + O₂ (g)→2 SO₃ (g) D H = - 197 kJ What is D H for the formation of 8.00 g of SO₃?

Quizplus · Accepted Answer

The molar mass of SO₃ is 80.06 g/mol. 8.00 g of SO₃ is 0.1 mol. The reaction produces 2 mol of SO₃ with ΔH = -197 kJ, so for 0.1 mol, ΔH = -197 kJ * (0.1/2) = -9.85 kJ.

Given the Thermochemical Equation