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Equivalent Mass

When 0.24 g o...

Question

When 0.24 g of magnesium was burst in an atmosphere of oxygen, the residue formed weighed 0.40 g. The equivalent weight of magnesium is :

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Solution

Magnesium present initially was $0.24 g$ and magnesium oxide(residue) formed is $0.40 g$ .
Oxygen combined $= 0.16 g$ .
$0.16 g$ oxygen $\equiv 0.24 g$ $M g$ .
Thus, $8 g$ oxygen $\equiv 12 g$ $M g$ .

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