Question

Total number of nucleons present in 18ml of water is
1) 10 NA
2) 100 NA
3) 18NA
4) 4 NA

Answer 1

1) 10 NA

We know density of water is 1 gm/cc or 1 gm/ml. So 18 ml of water contains 18 gm of water implies 1 mole of water.

By Avogadro no. 1 mole of water contains 6.023 x 10^(23) molecules of water.

But each molecule of water contains 10 electrons.(protons)

Thus 6.023 x 10^(23) molecules of water will contain 10 x 6.023 x 10^(23) electrons(protons)= 6.023 x 10^(24) electrons(protons)
=10NA