A compound contains 3.2% of Oxygen. The minimum molecular weight of the compound is ____kg?

For molecular mass to be minimum at least one gram atom of oxygen (16 gram of oxygen) should be present.        3.2 gram of oxygen = 100 grams of the compound          16 gram of oxygen = 16×100/3.2=500 gram Minimum molecular mass of compound = 500 gram/mole