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'''Hydrate'''- an ionic substance that has a certain number of water molecules bounded to it (it is assumed that it is one moleule of the ionic compound). <br> <b>Anhydrous</b> - it is the hydrate without the water so it really is only the ionic compound.<br> '''Percent Hydrate''' = (mass of H<sub>2</sub>0 / mass of total sample) x 100% '''''Example''''' Ferric chloride hexahydrate (<nowiki>FeCl</nowiki><sub>3</sub> x 6H<sub>2</sub>0) Answer: Mass of sample = 55.85g Fe + 3(35.45g Cl) + 12(1.008g H) + 6(16.00g O) = 270.296g <nowiki>FeCl</nowiki><sub>3</sub> x 6H<sub>2</sub>0 Percent Hydrate = (12(1.008g H) + 6(16.00g O)/270.296g <nowiki>FeCl</nowiki><sub>3</sub> x 6H<sub>2</sub>0) x 100% = 39.9917 = 40.0%
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