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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)`

A

301 kJ/mol

B

320 kJ/mol

C

309 kJ/mol

D

280 kJ/mol

Text Solution

Verified by Experts

The correct Answer is:
C
`S(g) + 6F(g) rarr SF_(6)(g)`
`Delta H_(f) (s) + 6Delta H_(f)(F) - 6(S - F) B.D = Delta H_(f) = Delta H_(f) (SF_6)`
`275 + (6 xx 80) -6(S - F) = -1100`
`275 + 480 + 1100 = 6(S -F)`
`(1855)/6 = (S - F) = 309 kJ//mol`
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