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

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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 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.

Related Questions:

1. Which of the following hydrides is electron deficient molecule?
2. Which of the following oxides is amphoteric in character?
3. Which of the following undergoes sublimation
4. The intermediate formed in aldol condensation is
5. The number of spherical nodes in 3p orbitals are

Topics: Thermodynamics (179)
Subject: Chemistry (2512)

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