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Chlorophyll, the green pigment of plants...

Chlorophyll, the green pigment of plants responsible for photosynthesis contain 2.68% of Mg by weight. Calculate the number of magnesium atoms in 20 g of chlorophyll.

Text Solution

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The weight % of Mg as 2.68
i.e.,100g of chlorophyll contains 2.68g of Mg
2 g of chlorophyll will contain Mg
`=(2.68)/(100) xx 20`
=0.5349
1 mole of Mg =24g `= 6.023xx 10^(23)" atoms"`
0.0536 g of Mg will have `=(6.023 xx 10^(23))/(24)xx0.536`
`= 0.1345 xx 10^(23)" atoms of Mg"`
`= 1.345 xx 10^(22)`
Number of Magnesium atoms present in 20g of chlorophyll is `1.345 xx 10^(22)`
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