1.

Chlorophyll, the green colouring matter of plants responsible for photosynthesis, contains 2.68% of magnesium by weight. Calculate the number of magnesium atoms in 2.0 g of chlorophyll.

Answer»


Solution :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"`


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