Question

An organic compound contains 1.6% of O. The minimum molecular mass of the compound is:

• A. 1000 g/mol
• B. 900 g/mol
• C. 320 g/mol
• D. 960 g/mol

Answer 1

The correct option is A 1000 g/mol

Assuming 100 g of the sample to be present,
100 g contains 1.6 g of O.
Assuming the number of O atom present in one molecule of compound to be one, the mass of O present in 1 mole of the substance is 16 g.

Molar mass of the substance = $\frac{100\times 16}{1.6}=1000$ g/mol