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The percentage of oxygen in a metallic o...

The percentage of oxygen in a metallic oxide of a bivalent metal is `20.1%`. The molecular weight of the compound is `79.5`. Write the molecular formular of the compound, considering the symbol of the metal as M and find out the atomic weight of the metal.

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(i) calculate the number of atoms of oxygen present in the compound
(ii) calculation of the number of atoms of oxygen present in one molecule of the metallic oxide from the percentage of oxygen given
(iii) determination of the formula of the compound
(iv) calculation of atomic weight of the metal
(v) `63.5`
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