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What is the mass of Cl2 if the mass of Ca is 20.0g and the mass of CaCl2 is 78.33g

User Gardener
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The molar mass of chlorine is 35.5 grams per mole, and calcium chloride contains two equivalents of chlorine. So in one mole of calcium chloride, there are two times 35.5 grams of chlorine. This gives 71 grams.
User Vikki
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