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The values of heat of formation of SO₂ and SO₃ are -298.2 kJ and -98.2 kJ. The heat of formation of the reaction SO₂ + 1/2O₂ → SO₃ will be

1. -200 kJ
2. -356.2 kJ
3. +200 kJ
4. -396.2 kJ

Correct answer: -200 kJ

Solution

The heat of formation of the reaction is calculated as the difference between the heat of formation of SO₃ and SO₂. ΔH = (-98.2) - (-298.2) = -98.2 + 298.2 = -200 kJ.

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