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To find no; of atoms of hydrogen, we need to find the no; of water molecules in 1 pL of water.

Density of water = mass/volume = 1 g/cc

mass of 1pL of water = density * volume

= 1 g/cc * 10-9 cc (1L = 103 cc, so 10-12 L = 10-9 cc)

= 10-9 g

18g of H2O = 6.023 * 1023 molecules.

hence, 10-9 g of H2O = 3.346 * 1013 molecules of H2O

1 molecule of H2O = 2 atoms of H

hence 1pL = 6.692* 1013 atoms of H

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