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A salt crystal has a mass of 0.12 mg. how many NaCl formula units does it...

A salt crystal has a mass of 0.12 mg. how many NaCl formula units does it contain? Show work, (1000mg=1gram)
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Answer #1

mass of NaCl crystals = 0.12 x 10^-3 g

moles of NaCl = 0.12 x 10^-3/58.44 g/mol

                        = 2.05 x 10^-6 mols

Thus we would have = 2.05 x 10^-6 x 6.023 x 10^23

                                  = 1.24 x 10^18 formula units of NaCl

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