Question

Pls answer....
I will mark brainliest...

Chlorophyll,the green colouring matter of plants contains 2.68% of Mg by weight .calculate the no. of Mg atoms in 2g of it ( atomic mass of Mg =24g)

Answer 1

Amount of Mg in 2g sample = 2.68% of 2g
= 0.0536 g
No. Of moles of Mg = 0.0536 ÷ 24
= 0.00223 mol
No. Of Mg atoms = 0.00223 × NA
(Where NA is the avogadro constant)
(NA = 6.022 × 10^23)
= 1.34 × 10^21 Ans.