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Solution: Sulfur tetrafluoride (SF4) reacts slowly with O2 to form sulfur tetrafluoride monoxide (OSF4 ) according to the following unbalanced reaction: SF4(g) + O2(g) → OSF4(g). The O atom and the four F atoms in OSF4 are bonded to a central S atom.Use average bond enthalpies (D(S-F) = 327 kJ/mol, D(O=O) = 495 kJ/mol, D(S=O) = 523 kJ/mol) to estimate the enthalpy of the reaction. Is it endothermic or exothermic?

Problem

Sulfur tetrafluoride (SF4) reacts slowly with O2 to form sulfur tetrafluoride monoxide (OSF4 ) according to the following unbalanced reaction: SF4(g) + O2(g) → OSF4(g). The O atom and the four F atoms in OSF4 are bonded to a central S atom.

Use average bond enthalpies (D(S-F) = 327 kJ/mol, D(O=O) = 495 kJ/mol, D(S=O) = 523 kJ/mol) to estimate the enthalpy of the reaction. Is it endothermic or exothermic?