Explanation: 1- we get the number of moles: One mole of any substance contains Avogadro's number of atoms. To get the number of moles in 3.01 * 10²³ atoms, we will simply do cross multiplication as follows: 1 mole ..................> 6.02 * 10²³ atoms ?? moles ..............>3.01 * 10²³ atoms Number of moles = (3.01 * 10²³ * 1) / (6.02 * 10²³) Number of moles = 2 moles
2- we get the mass: number of moles = mass / molar mass We have: number of moles = 2 moles molar mass (using the periodic table) = 12 grams Therefore: 2 = mass / 12 mass = 2 * 12 mass = 24 grams
