Estimate the average S-F bond energy in SF6. The values of standard enthalpy of formation of SF6(g), S(g) and F(g) are -1100, 275 and 80 kJ/mol, respectively.

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Question

Prashant Kotian · Accepted Answer

Correct answer: B. SF6(g) -> S(g) + 6F(g); δ H = 275 + 6*80 - (-1100) = 275 + 480 + 1100 = 1855 kJ/mol. Average BE(S-F) = 1855/6 = 309.17 kJ/mol.

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