70. A salt crystal has a mass of 0.12 mg. How many NaCl formula units does it contain?

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To Determine: The formula units in of a salt crystal.Answer: The formula units in of a salt crystal is .Explanation:The number of molecules in the given sample is calculated by first determining the number of moles in the sample and then using Avogadro’s number as a conversion factor.The number of moles in is calculated as follows:Substitute for, for.Now,

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