Chlorophyll, the green colouring matter of plants responsible for photosynthesis, contains 2.68 % of magnesium by mass. Calculate the number of magnesium atoms in 2.00 g of chlorophyll.

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100 g chlorophyll contains 2.68 g M g = 2.68 24 mole M g 2 g chlorophyll contains 2.68 × 2 24 × 100 mole M g = 2.2 × 10 - 3 m o l e M g No. of M g a t o m s = 2.2 × 10 - 3 × 6.023 × 10 23 = 1.345 × 10 21 a t o m s o f M g

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