... oxygen is given as 15.999 g/mol. The number of atoms or ions in one mole of any element (or the number of molecules in one mole of any compound) is defined to be equal to Avogadro's number (Van Vlack, 1989). Avogadro's number states that a mole of any element possesses 6.02 x 1023 atoms or ions of that element (Van Vlack, 1989). Substituting these values into the above equations, we can calculate the contribution to the mass of the CaO unit cell from the Ca2+ and O2- ions. with significant figures applied with significant figures applied Therefore, the total mass of the unit cell of CaO can be calculated by summing the mass component of the Ca2+ ions and the mass component of the O2- ions. This is determined in the following manner: with significant figures applied The mass/volume of a material is defined to be equal to its density. We can state this relationship ...

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