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

(A) 301 kJ mol-1

(B) 320 kJ mol-1 

(C) 309 kJ mol-1

(D) 280 kJ mol-1

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(C) 309 kJ mol-1 


Therefore heat of formation

= Bond energy of reactant – Bond energy of product

-1100 = [275 + 6 x 80] - [6 x S - F]

Thus bond energy of S – F = 309 kJ mol-1

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