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Q.
A compound contains $3.2 \%$ of oxygen. Find the minimum molecular weight of the compound.
Some Basic Concepts of Chemistry
Solution:
The compound must contain at least one oxygen atom. So, a minimum of $1\, g$ atom of oxygen will be present in $1 \,g$ molecule, i.e., $1 \,mol$ of the compound.
If $M$ is the molecular weight of the compound, then since $16$ is the atomic mass of oxygen, so minimum of $16 \,g$ of oxygen will be present in $M$ gram of the compound.
Thus, \% of oxygen $=\frac{16}{M} \times 100$
or $3.2=\frac{16 \times 100}{M}$ or $M=500$