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A 0.5 gram sample of calcium chloride dihydrate (CaCl2 • 2H2O) is heated driving off the...

A 0.5 gram sample of calcium chloride dihydrate (CaCl2 • 2H2O) is heated driving off the water. The dehydrated calcium chloride (CaCl2) weighs 0.38 grams. What was the % H2O by mass? Hint: Just use grams, there is absolutely no need for moles this time. It is not a trick question.

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Answer #1

Mass of water = mass of Call2. 2H20 - mars of = 0.5 g - 0.30 g Calla = 012 ge Mass % of H₂O = mars of H20 X 100 Total mass o

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