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Question

The average SF bond energy in SF6 if the ΔHof values are 1100, +275 and +80 kJ/mol respectively for SF6(g), S(g) and F(g) is:

A
390.1 kJ/mol
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B
103.9 kJ/mol
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C
903.1 kJ/mol
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D
309.1 kJ/mol
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Solution

The correct option is A 309.1 kJ/mol
Given that:
S(s)+ 3F2(g) SF6(g); Δ H = 1100 kJ (1)
S(s) S(g); Δ H = 275 kJ (2)
12 F2(g) F(g); Δ H = 80 kJ (3)
To have SF6(g) S(g)+ 6F(g) we can proceed as
equation(2)+6×equation(3)equation(1)
SF6(g) S(g)+ 6F(g); Δ H = 1855 kJ
Thus average bond energy for SF bond=18556=309.16kJ.

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