Question

An organic compound contains $1.6\%$ of oxygen atom. The minimum molecular mass of the compound is about:

• A. $1000\text{g/mol}$
• B. $900\text{g/mol}$
• C. $320\text{g/mol}$
• D. $960\text{g/mol}$

Answer 1

The correct option is A $1000\text{g/mol}$

Assuming $100\text{g}$ of the sample to be present, $100\text{g}$ contains $1.6\text{g}$ of oxygen atoms.
Assuming the number of oxygen atom present in one molecule of compound to be one, the mass of oxygen present in $1$ mole of the substance is $16\text{g}$.
Therefore minimum molar mass of the substance = $\frac{100\times 16}{1.6}=1000\text{g/mol}$