What is the volume of 0.01 mol of oxygen? calculate the mass of 0.1 mol of oxygen.

oxygen volume = 0.224 l (mk volume is equal to the product of the amount of substance by the molar volume, which is 22.4 l / mol).
the mass of oxygen is equal to the product of the molar mass (see in the periodic table 16 g \ mol * 2 = 32 g \ mol) by the amount of substance (given in the condition) = 0.1 mol * 32 g \ mol = 3.2 g