(a) Calculate the number of atoms/molecules present in the following:
(a) 10g of Hg

Explanation

(a) 10g of Hg
Atomic mass of Hg=200 `gmol^(-1)` 200g of mercury contains `6.023 xx 10^(23)` atoms of mercury
10g of mercury contains
`=(10xx6.023xx10^(23))/(200)`
`=0.301xx10^(23)=3.01xx10^(22)` atoms of mercury.