Chlorophyll, the green colouring matter of plants responsible for photosynthesis, contains `2.68%` of magnesium by mass. Calculate the number of magnesium atoms in `2.00 g` of chlorophyll.

Explanation

Mass of chlorophyll = 2.0 g
Percentage of Mg = 2.68%
Mass of Mg in 2.0 g of chlorophyll `=(2.68 xx 2.0)/100`
=0.054 g
`6.022 xx 10^(23)` atoms of magnesium = 24 g
24 g of Mg contains `=6.022 xx 10^(23)` atoms
0.054 g of Mg contains `=(6.022 xx 10^(23))/24 xx 0.054`
`=1.3 xx 10^(21)` atoms.