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2H(2)+O(2)to2H(2)O,DeltaH=-571.6kJ. Does...

`2H_(2)+O_(2)to2H_(2)O,DeltaH=-571.6kJ`. Does this equation express the thermochemical equation for the formation of `H_(2)O`?

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No, because physical states of the reactants and products are not mentioned in the reaction.
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Given: C(s)+O_(2)(g)toCO_(2)(g),DeltaH=-393.5kJ 2H_(2)(g)+O_(2)(g)to2H_(2)O(g),DeltaH=-571.6kJ Calculate DeltaH of the reaction: C(s)+2H_(2)O(g)toCO_(2)(g)+2H_(2)(g) .

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