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Use Hess's Law to calculate the enthalpy change for the reaction: GdO3 + 3H2(g) -> Gd(s)...

Use Hess's Law to calculate the enthalpy change for the reaction:

GdO3 + 3H2(g) -> Gd(s) + H2O (g)

from the following data:

2Gd(s) + 3O2 --> 2GdO3(s)   ^H=-685.4kJ

2H2 (g) + O2 (g) --> 2H2O(g)     ^H= -47.8kJ

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