Question

A compound was found to contain 9.6% of oxygen. What is the minimum molar mass of of the compound?

• A. $166.67\text{g/mol}$
• B. $133.33\text{g/mol}$
• C. $260.67\text{g/mol}$
• D. $156.67\text{g/mol}$

Answer 1

The correct option is A $166.67\text{g/mol}$

Let, weight of the compound be100 g.
Then, weight of oxygen will be 9.6 g.
Number of moles of the oxygen $=\frac{9.6}{16}=0.6\text{mol}$
For minimum molar mass, 1 mol of substance will have 1 mol of oxygen.
$\therefore$ Minimum molar mass of the compound $=\frac{100}{0.6}=166.67\text{g/mol}$