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5g of pure MgO (obtained by reaction of ...

5g of pure MgO (obtained by reaction of metallic magnesium with oxygen) contains 3g of Mg. again 8.5 g of pure MgO (obtained by heating `MgCO_(3)`) contains 5.1g of Mg. show that these results are in accordance with the law of constant proportions.

Text Solution

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In the first variety of MgO, ratio of masses of Mg to O=3:(5-3)=3:2
In the second vriety of MgO, ratio of the masses of Mg to O
=5.1:(8.5-5.1)=5.1:3.4=3:2
So independet of its source, MgO always contains Mg and O in the mass-ratio of 3:2 and thiis is in accordance with the law of constannt proportions.
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