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Number of water molecules in the drop of water,if 1 ml of water has 20 drops and A is Avogadros number, is
(C) 0.05A/18
Explanation:
One drop has a volume of 0.05 ml and therefore a mass of about 0.05 g; dividing by 18 g/mol and multiplying by Avogadros number gives 0.05A/18 molecules.