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Estimate the average S-F bond enthalpy i...

Estimate the average `S-F` bond enthalpy in `SF_(6)`. The values of standard enthalpy of formation of `SF_(6)(g),S(g)` and `F(g)` are :-`1100, 274` and `80 kJ mol^(-1)` respectively.

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Aim `: (1)/(6) [SF_(6)(g) rarrS(g) +6F(g)],DeltaH=?`
For the reaction , `SF_(6)(g) rarrS(g) + 6F(g)`
`Delta_(f)H = Delta_(f)h^(@) [S(g)+ 6[Delta_(f)H^(@) F (g)]-[Delta_(f)H^(@) SF_(6)(g)=275 + 6(80)-( -1100) kJ mol^(-1) = 1855kJ mol^(-1)`
`:. ` AverageS-F bond energy `= ( 1855)?( 6) =309.16 kJ mol^(-1)`
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