Problem: A salt crystal has a mass of 0.15mg. How many NaCl formula units does it contain? Express your answer using 2 significant figures.

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Molar mass of NaCl: The molar mass of NaCl is:

NaCl    1 Na × 22.99 g/mol Na  = 22.99 g/mol           

            1 Cl  × 35.45 g/mol Cl   = 35.45 g/mol     

                                          Total: 44.01 g/mol


Avogadro’s Number: 6.022 × 1023 NaCl formula unit in 1 mole CO2.


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A salt crystal has a mass of 0.15mg. How many NaCl formula units does it contain? Express your answer using 2 significant figures.

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