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Chlorophyll, the green colouring matter ...

Chlorophyll, the green colouring matter of plant contains 2.68% of magnesium by weight. Calculate the number of magnesium atom in 2.0g chlorophyll.

Text Solution

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We are given that Mass of chlorophyll= 100g
100g of chlorophyll contains = 2.68 g of Mg
We are to calculate the number of magnesium atoms in 2.0g chlorophyll.
`therefore` 2g of chlorophyll would contain `= (2.68)/(100) xx 2= 5.36 xx 10^(-2)g` of Mg
Gram atomic mass of magnesium = 24g
24g of magnesium contains = `6.023 xx 10^(23)` atoms
1g of Mg will contain = `(6.023)/(24) xx 10^(23)` atoms `5.36 xx 10^(-2)g` of Mg will contain `=(6.023 xx 10^(23))/(24)xx 5.36 xx 10^(-2)= 1.34 xx 10^(21)` atoms.
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