if 1 mL of liquid water contains 20 drops then number
of molecules in one drop of water is ...
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Given, 20 drops of Water = 1 mL
so, 1 drop of water = 1/20 mL
Density of water = 1g/mL
and volume = 1/20 mL
so, mass of 1 drop of water = 1*1/20 = 1/20 gram
so, no. of moles = 1/20*18 = 1/360
so, no. of molecules = A/360 = 6.022*10^23/360 = 1.672 * 10^21
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