What is the mass of oxygen in which the amount of substance is 500 mol?

Initial data: ν (amount of oxygen substance) = 500 mol.

Reference values: according to the condition of the problem, M (molar mass of oxygen (diatomic gas)) = 0.032 kg / mol.

The mass of oxygen, which is contained in 500 mol of a substance, can be calculated from the formula: ν = m / M, whence m = ν * M.

Let’s calculate: m = 500 * 0.032 = 16 kg.

Answer: The mass of 500 mol of oxygen is 16 kilograms.