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Aluminum Chloride has a formula of AlCl3 giving it 4 total atoms per molecule. Aluminum has a charge of +3 and Chlorine's most common charge is -1 meaning you need 3 chlorine for every 1 Aluminum to cancel the charges. Because of the chlorine, it would most likely be aqueous, or dissolved in a liquid. Aluminum Chloride has a formula of AlCl3 giving it 4 total atoms per molecule. Aluminum has a charge of +3 and Chlorine's most common charge is -1.
With the aluminum nitrate example, there are 3 (NO3) ions present in the compound. Multiply the number of ions of your molecule of interest to the total number of moles of the substance. Again, with the example, we would do 3*1.02 moles = 3.06 moles of (NO3).