Calculate the number of molecules in a drop of water weighing 0.048 g.

1.	Calculate the number of molecules in a drop of water weighing 0.048 g.
Answer» SOLUTION :The GRAM molecular mass of water = 18.016 g. This mass CONTAINS `6.022 xx 10^(23)` molecules. Thenumberofmoleculescontainedin 0.048 g `=(6.022 xx 10^(23))/(18.016)xx 0.048 = 1.604 xx 10^(21)` Hence, one drop of water contains `1.604 xx 10^(21)`molecules.

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