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Chlorophyll, the green colouring matter of plants, contains 2.68% of magnesium by mass. Calculate the number of magnesium atoms is 3.00g of chlorophyll. [Atomic mass of magnesium=24.3g]

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Mass of magnesium in 300g of chlorophyll
`=(2.68xx3)/(100)=0.080g`
24.3g of Mg contains`=6.02xx10^(23)` atoms
0.080g of Mg contains =`(6.02xx10^(23))/(24.3)xx0.080`
`=1.98xx10^(21)` atoms.
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