The amount of oxygen is equal to 3. Find the mass, volume, number of molecules, atoms.

Snaaa, let’s determine the mass of oxygen. We write down the solution.
n = m / M.
Where n is the amount of substance.
m is the mass of the substance.
M is the molar mass of the substance.
M (О2) = 2 × 16 = 32 g / mol.
m = n × M = 3 mol × 32 g / mol = 96 g.
This means that the mass of oxygen is 96 grams.
Next, we find the volume of oxygen.
n = V / Vm.
V = n × Vm = 3 mol × 22.4 L / mol = 67.2 L.
The oxygen volume is 67.2 liters.
Next, we find the number of molecules, atoms.
Na = 6.02 * 10 ^ 23 N = Na * n = 6.02 * 10 ^ 23 * 3 mol = 18.06 * 10 ^ 23 molecules.
Answer: m = 96 g, V = 67.2 l, N = 18.06 * 10 ^ 23.