Hi, excellent question!
This is an example of a chemical reaction where the product formed will be highly reactive. We also know that H2O is the universal solvent and will always dissociate once in solution with another compound.
First, we must consider the dissociation of water and the separation of Xenon from the tetra-ferrous compound.
Equation: XeF4 + H2O --> XeO3 + Xe + O2 + HF
Next, we must balance the equation:
Balanced equation with final products: 6 XeF4 + 12 H2O --> 2 XeO3 + 4 Xe + 3 O2 + 24 HF
I hope this helps!