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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?

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Hrxn=Hbond, reactants-Hbond, products


Balanced reaction: 2SF4(g) + O2(g) → 2OSF4(g)

                                    Reactants                        products

                                    S -1 2              S - 1

                                    O - 2                O - 1

                                    F - 4 8             F - 4

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Problem Details

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?

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Based on our data, we think this problem is relevant for Professor Exton's class at UO.