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Q.

Estimate the average S-F bond energy in SF6. The standard heat of formation values of SF6(g), S(g), and F(g) are : - 1100, 275, and 80 kJ and mol-1 respectively.  

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answer is 309.17.

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Detailed Solution

 Given S(s)+3F2(g)SF6 ; ΔH=1100kJ (1)S(s)S(g)                                                   ...(2)ΔH=275kJ12F2(g)F(g)     ΔH=80kJ                          ...(3) Toget SF6(g)S(g)+6F(g) , we can proceed as (2)+6×(3)1SF6(g)S(g)+6F(g); ΔH=1855kJ Thus,averagebondenergy =18556=309.17 

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