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The standard heat of formation values of...

The standard heat of formation values of `SF_(6)(g), S(g)`, and `F(g)` are `-1100, 275`, and `80 kJ mol^(-1)`, respectively. Then the average `S-F` bond enegry in `SF_(6)`

Text Solution

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Given, `S_((s))+3F_(2(g))rarr SF_(6),DeltaH=-1100kJ ....(1)`
`S_((s)) rarr S_((g)),DeltaH=275kJ ...(2)`
`(1)/(2)F_(2(g))rarr F_((g)), DeltaH=80kJ ..(3)`
To get `SF_(6(g))rarr S_((g))++6F_((g)),,`
we can proceed as `eq. (2)+6xxeq.(3)-eq.(1)`
`SF_(6(g))rarrS_((g))+6F_((g)),DeltaH=1855kJ`
Thus, average bond energy `=(1855)/(6)=309.17`
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Knowledge Check

  • The standard enthalpies of formation of SF_(6)(g) , S(g) and F(g) are -1150 , +280 and +85KJmol^(-1) . Thus, average bond energy of (S-F) in SF_(6) is

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    B
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    D
    `323.33KJmol^(-1)`

  • What is average S-F bond energy in SF_(6) ? Given: DeltaH_(t) of SF_(6)(g) , S(g) and F(g) are -1100,275 and 80 kJ mole^(-1) respectively.

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