The values of heat of formation of SO₂ and SO₃ are -298.2 kJ and -98.2 kJ.

The Values Of Heat Of Formation Of So And So Chemistry QuestionThe Values Of Heat Of Formation Of So And So Chemistry Question

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

Options

(a) 200 kJ
(b) -356.2 kJ
(c) -200 kJ
(d) -396.2 kJ

Correct Answer:

200 kJ

Explanation:

Values of heat formation of SO₂ = -298.2 kJ and that of SO₃ = -98.2 kJ.
Therefore S(s) + O₂(g) → SO₂(g) , ΔH = -298.2 kJ ..(i)
and S(s) + (3/2)O₂(g) → SO₃(g), ΔH = -98.2 kJ ..(ii)
Subtracting equation, (i) from (ii), we get,
SO₂ + 1/2O₂ → SO₃. ΔH = -98.2 – (-298.2) = 200 kJ.

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