Why does Na2CO3H2O break down

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Why does Na2CO3H2O break down into Na2CO3+H2O? The rule in our notes says that a hydrated salt will always decompose into the salt and water, but we also have another rule in those notes that says a metallic carbonate always has to break down into a metallic oxide and carbon dioxide. So, wouldn't the products be NaO+CO2+H2O instead? (it's not balanced obviously) I don't understand, am I not supposed to use all the decomposition rules for the reaction?

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(Top Tutor) Daniel C.
School: UT Austin
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