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

13. Which of the following statements is correct? (A) The removal of one electron in O2 decreases its bond order to 1.5. (B) The bond strength of OF is expected to weaken as an electron is removed to form the positive charged ion.(C)The bond strength of B2 is expected to increase as an electron is removed to form the positive charged ion. (D)CO+ is diamagnetic. (E)The bond order of N2+ is 2.5.

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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