Heat of formation of H₂O(g) at 25⁰C is -243 kJ,ΔE for the reaction

Heat Of Formation Of Hog At 25c Is 243 Kje Chemistry Question

Heat of formation of H₂O(g) at 25⁰C is -243 kJ,ΔE for the reaction H₂(g) + 1/2 O₂(g) → H₂O(g) at 25⁰C is

Options

(a) -243 kJ
(b) -241.8 kJ
(c) 241.8 kJ
(d) 243 kJ

Correct Answer:

-241.8 kJ

Explanation:

H₂(g) + 1/2 O₂(g) → H₂O(g),
ΔHf = -243 kJ, ΔH = ΔE + Δn(g)RT,
where ΔH = enthalpy change of reaction = -243 kJ,
ΔE = internal energy change of reaction, Δn(g) = number of gaseous product – number of gaseous reactant = 1-(1+ 1/2) = – 1/2. ⇒ ΔE = ΔH – Δn(g)RT = -243000 + 0.5 x 8.314 x 298 = -241.76 kJ.

Related Questions:

  1. Which of the following is a strong acid
  2. Which of the following statements is not correct for a nucleophile
  3. In the Dumas method of estimation of nitrogen,the nitrogen in the organic compound
  4. Silver is present in
  5. Different gases at the same temperature must have

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.

NEETLab Mobile App

Share this page with your friends

Be the first to comment

Leave a Reply

Your email address will not be published.


*