Question

1. Chlorophyll, the green colouring matter of plants
contains 2.68% of magnesium by weight.
Calculate the number of magnesium atoms in
2.00 g of chlorophyll (at, mass of Mg = 24)
​

Answer 1

Mass of Mg present in 2g of Chlorophyll = (2.68/100) x 2 g = 0.054 g

Also that, 24 g of Mg contain 6.023 x 1023 atoms of Mg

-------------- 1g of Mg = (6.023 x 1023)/24 atoms of Mg

Hence, 0.054 g of Mg will contain (6.023 x 1023/24 ) x 0.054 atoms of Mg

= 1.34 x 1023 atoms of Mg present in 2.00 gram of chlorophyll.

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