Chlorophyll extracted from the crushed green leaves was dissolved in water to make 2L solution of Mg of concentration 48ppm. The number of atoms of Mg in this solution is $\mathrm{x}\times {10}^{20}$ atoms. The value of x is (Nearest Integer) (Given : Atomic mass of $\mathrm{Mg}\text{ is }24\mathrm{g}{\mathrm{mol}}^{-1};N_A=6.02\times {10}^{23}{\mathrm{mol}}^{-1}\text{ ) }$