Which of the following statement(s) is/are ture?

Chemistry Thermodynamics and Thermochemistry General Single Correct MCQ

Published on: August 13, 2026

Δ E = 0 for combustion of C 2 H 6 (g) in a sealed rigid adiabatic container

Δ f Hº (S, monoclinic) ≠ 0

If dissociation energy of CH 4 (g) is 1656 kJ/mol and C 2 H 6 (g) is 2812 kJ/mol, then value of C—C bond energy will be 328 kJ/mol

If Δ H f (H 2 O,g) = – 242 kJ/mol; Δ H vap (H 2 O, l) = 44 kJ/mol then Δ f Hº (OH – ,aq.) will be – 142 kJ/mol

Text Solution

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The correct answer is:

CHECK THE SOLUTION.

(a,b,c)

Δ E will be – ve for combustion reactions

Δ H f ° (S, rhombic) = 0

CH 4 (g) — → C(g) + 4H (g) Δ H = 1656 kJ/mole = 4 Δ H C–H

C 2 H 6 (g) — → 2C(g) + 6H (g) Δ H = 2812 kJ/mole = 6 Δ H C–H + Δ H C–C

so Δ H C–C = (2812 – × 1656) kJ/mole = 328 kJ/mole

Can not be concluded from given data.

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