The density of a liquid is 1.2 g/mL. There are 350 drops in 20 mL. The number of molecules in 1 drop is: (Molecular weight of liquid = 70u)
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Volume of one drop = 2/35 ml
Moles in one drop = 1.2/(35)^2 mol
Number of molecules in one drop = 1.2/(35)^2 ×Na
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