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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1.345 x 10²³ atoms of Mg

1.345 x 10²⁸ atoms of Mg

1.345 x 10²² atoms of Mg

1.345 x 10²¹ atoms of Mg

answer is D.

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Detailed Solution

100 g chlorophyll contains 2.68 g $Mg = \frac{2.68}{24} mole Mg$

2 g chlorophyll contains $\frac{2.68 \times 2}{24 \times 100} mole$

$Mg = 2.2 \times 10^{- 3} mole Mg$

No. of

Mg atoms $= 2.2 \times 10^{- 3} \times 6.023 \times 10^{23}$

$= 1.345 \times 10^{21} atoms of Mg$

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