ThermochemistryHard

Question

Estimate the average S–F bond energy in SF6. The values of standard enthalpy of formation of SF6(g), S(g) and F(g) are −1100, 275 and 80 kJ/mol, respectively.

Options

A.183.33 kJ/mol
B.309.17 kJ/mol
C.366.37 kJ/mol
D.345 kJ/mol

Solution

$SF_{6}(g) \rightarrow S(g) + 6F(g)$

$\Delta H = (275 + 6 \times 80) - ( - 1100) = 6 \times B.E._{S - F} $$$\therefore B.E._{S - F} = 309.17\text{ kJ/mol}$$

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