Answer to Question #112950 in General Chemistry for Kennedy Costello

Question

This is the question:
Chlorophyll, the green pigment in plants responsible for the conversion of light in energy, contains 1 atom of Mg per molecule of chlorophyll. This Mg accounts for 2.71% of the mass of chlorophyll. What will be the approximate molar mass of chlorophyll?

Answer 1

So there is one atom of magnesium in molecule of chlorophyll

let us consider on mole of chlorophyll so it will contain one mole magnesium

Hence the mass of one mole of magnesium is 24 grams which is 2.71 % of the total mass

hence the molecular mass of the compound is $24\times\frac{100}{2.71}$ =885.6 grams