The green coloured substance, which is responsible for photosynthesis is called chlorophyll. It contains 3% magnesium by weight (the atomic mass of magnesium is 24 u).
How many magnesium atoms are present in 10 g of chlorophyll?
The green coloured substance, which is responsible for photosynthesis is called chlorophyll. It contains 3% magnesium by weight (the atomic mass of magnesium is 24 u). |
How many magnesium atoms are present in 10 g of chlorophyll?
We are given that chlorophyll contains 3% by mass of magnesium. So, mass of magnesium present in 10g of chlorophyll will be
= (3 / 100) X 10
= 0.3g
Thus, 10g of chlorophyll will contain 0.3g of magnesium. Now, we are given that the atomic mass of magnesium is 24u. So, the mass of 6.023 X 1023 atoms of magnesium will be 24g. Thus
Number of atoms in 24g of magnesium = 6.023 X 1023
Number of atoms in 1g of magnesium = ( 6.023 X 1023 / 24)
Number of atoms in 0.3g of magnesium = ( 6.023 X 1023 X 0.3) / 24
= 7.529 X 1021 atoms
Thus, 10g of magnesium contains 7.529 X 1021 atoms of magnesium
We are given that chlorophyll contains 3% by mass of magnesium. So, mass of magnesium present in 10g of chlorophyll will be
= (3 / 100) X 10
= 0.3g
Thus, 10g of chlorophyll will contain 0.3g of magnesium. Now, we are given that the atomic mass of magnesium is 24u. So, the mass of 6.023 X 1023 atoms of magnesium will be 24g. Thus
Number of atoms in 24g of magnesium = 6.023 X 1023
Number of atoms in 1g of magnesium = ( 6.023 X 1023 / 24)
Number of atoms in 0.3g of magnesium = ( 6.023 X 1023 X 0.3) / 24
= 7.529 X 1021 atoms
Thus, 10g of magnesium contains 7.529 X 1021 atoms of magnesium
