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17 May, 23:17

A salt crystal has a mass of 0.18 mg. how many nacl formula units does it contain?

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  1. 17 May, 23:38
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    The molar mass of salt (NaCl) is 22.99+35.45 = 58.44 g/mol. If we have 0.18 mg of salt, this is equivalent to 0.00308 mmol NaCl, or 3.1E-6 mol NaCl. By definition, 1 mole contains 6.02E23 formula units, so multiplying this by the number of moles gives the answer, which is: 1.9E18 formula units.
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