The percent by mass of Magnesium (Mg) in chlorophyll is 2.69%.
The percent by mass of an element in a compound can be calculated by dividing the atomic mass of the element by the molar mass of the compound multiplied by 100.
The molar mass of chlorophyll is as follows: 12(55) + 1(72) + 24 + 14(4) + 16(5) = 660 + 72 + 24 + 56 + 80 = 892g/mol
Percent mass of Mg = 24/892 × 100
Percent mass of Mg = 0.0269 × 100
Percent mass of Mg = 2.69%
Therefore, the percent by mass of Magnesium (Mg) in chlorophyll is 2.69%.
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