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 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. The most acidic among the following is
2. Which of the following isomeric alcohols react fastest with HCL
3. Which of the following indicator is known as metal indicator
4. Which of the following pairs of a chemical reaction is certain to result
5. Chlorine is in +1 oxidation state in which of the following

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

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends