Q.

Calculate the number of magnesium atoms present in 2 g of Chlorophyll, a green colouring matter of plants responsible for photosynthesis, containing 2.68% of magnesium by mass.

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a

1.345 x 1023 atoms of Mg

b

1.345 x 1028 atoms of Mg

c

1.345 x 1022 atoms of Mg

d

1.345 x 1021 atoms of Mg

answer is D.

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Detailed Solution

100 g chlorophyll contains 2.68 g Mg=2.6824 mole Mg2 g chlorophyll contains 2.68×224×100 mole Mg=2.2×10−3 mole MgNo. of Mg atoms =2.2×10−3×6.023×1023=1.345×1021 atoms of Mg
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Calculate the number of magnesium atoms present in 2 g of Chlorophyll, a green colouring matter of plants responsible for photosynthesis, containing 2.68% of magnesium by mass.