Find the change in enthalpy for the imaginary reaction below, given the following imaginary reactions and change in enthalpy values. Give your answer in standard notation to zero decimal places (don't worry about sig figs for this one).   X2Y2 + 5/2 Z2 → 2 XZ2 + Y2Z ΔH = ?   Use: X2Y6 → X2Y2 + 2 Y2 ΔH = 667 kJ Y2Z → Y2 + 1/2 Z2 ΔH = -686 kJ 2 XZ2 + 3 Y2Z → X2Y6 + 7/2 Z2 ΔH = -158 kJ

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