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Chemistry 12 Online
OpenStudy (anonymous):

pls help me... chlorophyll contains 2 % by mass of Mg . The number of Mg atoms in 2 g chlorophyll is a. 10 ^ 21 b. 10 ^ 23 how to do this?? i got 2= mass of Mg /mass of chlorophyll * 100 is that right? i dont know 2 continue...help.

OpenStudy (anonymous):

You need to calculated 2% of 2g - that will give you the mass of magnesium. Then calculate the moles of magnesium (mass/atomic mass). The number of atoms is moles of magnesium x the number of particles in 1 mole

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