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The average S-F bond energy in kJ mol^(-...

The average S-F bond energy in kJ `mol^(-1)` of `SF_(6)` is ________ (Rounded off to the nearest integer)
[Given : The values of standard enthalpy of formation of `SF_(6)(g),S(g)` and F(g) are -1100, 275 and 80 kJ `mol^(-1)` respectively. ]

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`309.6 kJ "mol"^(-1)`
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