1 mole of any element or compound always represents these two things:
1)It contains 6.02x10^23 particles(atoms or molecules)
2)The number of molecules in a mole is defined so that the mass of one mole of a substance, expressed in grams, is equal to the substance's mean molecular weight. For example, hydrogen has an atomic weight of 1.0079 amu or 1.0079 g/mol. By this definition, 1 mol of hydrogen weighs 1.0079 g.