The number of water molecules in a drop of water weighing 5mg is

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answer is 3.

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Detailed Solution

Weight of drop of water = 5mg = 5×10-3 g 18g of H2O contain -----------------------6.023×1023 molecules5×10-3 g of H2O contain 'X' moleculesX = 5×10-3×6.023×102318X = 1.67×1020

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