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10.0 g of CaCO(3) on heating gave 4.4 g ...

10.0 g of `CaCO_(3)` on heating gave 4.4 g of `CO_(2)` and x g of CaO. Applying law of conservation of mass calculate the mass of CaO.

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According to the law,
Mass of reactants = mass of product, here
`CaCO_(3) to CO_(2) +CaO`
Hence, x = 10 g - 4.4 g = 5.6 g which is mass of Cao.
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