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A 0.60 g sample consisting of only CaC2O...

A `0.60 g` sample consisting of only `CaC_2O_4 and MgC_2O_4` is heated at `500^@C` converting the two salts of `CaCo_3 and MgCO_3`. The sample then weighs `0.465g` . If the sample had been heated to `900^@C`, where the products are `CaO and MgO`. What would the mixtures of oxides have weighted ?

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