XeO₃ reacts with excess XeF₆ to give an oxyfluoride P in which xenon is surrounded by five bonding domains; P reacts with more XeO₃ to give another oxyfluoride Q.
If x = number of 90° F-Xe-F bond angles in P, and y = total number of σ bonds in one molecule of Q, find (x + y).

Question

XeO₃ reacts with excess XeF₆ to give an oxyfluoride P in which xenon is surrounded by five bonding domains; P reacts with more XeO₃ to give another oxyfluoride Q.

If x = number of 90° F-Xe-F bond angles in P, and y = total number of σ bonds in one molecule of Q, find (x + y).

TestHub · Accepted Answer

XeO₃ + 2XeF₆ → 3XeOF₄, so P = XeOF₄ (square pyramidal, O axial): the four adjacent F-Xe-F angles are ≈ 90°, so x = 4. XeOF₄ + XeO₃ → 2XeO₂F₂, so Q = XeO₂F₂ : σ bonds = 2 (Xe-F) + 2 (Xe=O) = 4, so y = 4. x + y = 8.

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