Find the bond energy of S-S bond from the following data:
C₂H₅-S-C₂H₅(g); ΔH_f° = -148 kJ,
C₂H₅-S-S-C₂H₅(g); ΔH_f° = -202 kJ,
S(g); ΔH_f° = 222 kJ

Question

Find the bond energy of S-S bond from the following data: C 2 H 5 -S-C 2 H 5 (g); ΔH f ° = -148 kJ, C 2 H 5 -S-S-C 2 H 5 (g); ΔH f ° = -202 kJ, S(g); ΔH f ° = 222 kJ

TestHub · Accepted Answer

Inserting a gaseous sulfur atom into the sulfide forms a disulfide, creating one S–S bond:

C₂H₅SC₂H₅(g) + S(g) tarrow C₂H₅SSC₂H₅(g)

The enthalpy change for this reaction is Δ H = -202 - (-148 + 222) = -276 kJ.

Therefore, the bond energy for the S–S bond, BE(S–S), is 276 kJ/mol. This corresponds to option (a).

Chemistry - Thermochemistry Question with Solution | TestHub

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