Estimate the average S-F bond energyin SF_(6).The standard heat of formation valuesof SF_(6)(g), S(g)andF(g) are : - 1100,275 and80 Kj mol^(-1) respectively.

Estimate the average S-F bond energyin SF_(6).The standard heat of for

1.	Estimate the average S-F bond energyin SF_(6).The standard heat of formation valuesof SF_(6)(g), S(g)andF(g) are : - 1100,275 and80 Kj mol^(-1) respectively.
Answer» Solution :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)`