1.

Number of water molecules in the drop of water, if 1 mL of water has 20 drops and A is Avogadro's number, is

Answer»

0.5 A/18
0.05 A
0.5 A
0.05 A/18

Solution :1 drop of water `=1/20 mL = 1/20 g` `(d_(H_(2)O) = 1g mL^(-1))`
18 g of water = A MOLECULES
`therefore 1/20 g` water `=A/18 XX 1/20 = (0.05)/18` A molecules.


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