Chlorophyll, the green colouring matter of plants responsible for photosynthesis, contains `2.68%` of magnesium by mass. Calculate the number of magnesium atoms in `2.00 g` of chlorophyll.

Answer

`1.345xx10^(21)`

Explanation

100 g chlorophyll contains Mg = 2.68 g
`therefore " 2g chlorophyll will contain Mg"=(2.68)/(100)xx2=0.0536g`
1 mole of Mg = 24 g =`6.022xx10^(23)" atoms"`
`therefore" "0.0536gMg=(6.022xx10^(23))/(24)xx0.0536"atoms"=1.345xx10^(21)"atoms"`