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CGP EDU Academic Team
Published on: August 14, 2026
Using the data provided, calculate the multiple bond energy (kJ mol –1 ) of a C ≡ C bond C 2 H 2 . That energy is (take the bond energy of a C–H bond as 350 kJ mol –1 )
2C(s) + H 2 (g) ⎯→ C 2 H 2 (g) Δ H = 225 kJ mol –1
2C(s) ⎯→ 2C (g) Δ H = 1410 kJ mol –1 H 2 (g) ⎯→ 2H(g) Δ H = 330 kJ mol
–1
Text Solution
Verified by ExpertsThe correct answer is:
D
∴ Δ H = +1410 + 330 – (350 × 2) – ε C ≡ C = + 225
∴ ε C ≡ C = 1740 – 700 – 225 = + 815 KJ/mol
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