A salt crystal has a mass of 0.12 mg. How many NaCl formula units does it contain?
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moles = mass/molar mass.
∴n=given mass / Molar mass
n = [0.12 / 1000g](23+35.5)g/mol=2x10^-6moles
1 mol = 6.022×10²³
2.05 x 10^-6 mol will contain 1.2×10^18
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