Question

Chlorophyll contains 2.68% magnesium weight. How many molecules have magnesium in 2.0gm chlorophyll?​

Answer 1

Answer: Mass of chlorophyll = 2.0 g

Percentage of Mg = 2.68 g

2 68 x 2 0

Mass of Mg in 2.0 g of chlorophyll = 2.69 x 2.0/100= 0.054 g

6.022 X ${{10}^{23}}$ atoms of magnesium = 24 g

.’. 24 g of Mg contains 6.022 X ${{10}^{23}}$ atoms

0.054 g of Mg contains 6.022 X ${{10}^{23}}$/24 x 0.054

= 1.3x ${{10}^{21}}$ atoms