Consider the substances below.• 1 mol of beryllium• 1 mol of salt• 1 mol of water• 1 mol of hydrogenWhich statement is true about these substances?

One mole of each substance contains the same number of particles, but each particle has a different mass. For example, 1 mol of beryllium has a mass of about 9 g, while 1 mol of water has a mass of about 18 g. Therefore, they have different masses. They do not all have the same number of atoms either, because water and hydrogen particles contain multiple atoms.

AI-written and checked against the verified answer.