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  4. An oxide of a metal (M) contains 40 % by mass of oxygen. Metal (M) has atomic mass of 24. The empirical formula of the oxide is-

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Q. An oxide of a metal (M) contains $40 \%$ by mass of oxygen. Metal (M) has atomic mass of 24. The empirical formula of the oxide is-

Some Basic Concepts of Chemistry

Solution:

$40\, gm\, O$ present in $100 g$ metal oxide

$16 g ---\frac{100}{40} \times 16=40 g$

mol wt of metal oxide $=40\, g$

At wt of metal $=24\, g$

wt of oxygen $=16 \,g$

$\therefore $ Hence formula $= MO$