12. The standard enthalpies of formation for S(g), F(g), SF4(g), and SF6(g) are +278.8, +79.0, -775, and -1209 kJ/mol, respectively. Please use these data to estimate the energy of an S-F bond which could be_________ .
(A) 342.5 kJ/mol
(B) 357.8 kJ/mol
(C)434 kJ/mol
(D) 419 kJ/mol
(E)201 kJ/mol
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