Chlorophyll, the green colouring matter of plants contains 2.68% magne

1.	Chlorophyll, the green colouring matter of plants contains 2.68% magnesium by weight. Calculate the number of magnesium atoms in 4.00 g of chlorophyll. (Atomic mass of Mg = 24) 4.00 g of chlorophyll. (Atomic mass of Mg = 24)
Answer» Mass of chlorophyll = 4.0 g % of Mg = 2.68 Mass of Mg in 4.0 g of chlorophyll = \(\frac{2.68\times4}{100}\) = 0.1072 g 6.022 × 10²³ atoms of magnesium = 24 g \(\because\) 24 g of Mg contain 6.022 × 10²³ atoms \(\therefore\) 0.1072 g of Mg will contain = \(\frac{6.022\times10^{23}\times0.1072}{24}\) = 0.0269 x 10²³ ⁼2.69 × 10²¹ atoms

Chlorophyll, the green colouring matter of plants contains 2.68% magnesium by weight. Calculate the number of magnesium atoms in 4.00 g of chlorophyll. (Atomic mass of Mg = 24) 4.00 g of chlorophyll. (Atomic mass of Mg = 24)

Answer»

Mass of chlorophyll = 4.0 g

% of Mg = 2.68

Mass of Mg in 4.0 g of chlorophyll = \(\frac{2.68\times4}{100}\)

= 0.1072 g

6.022 × 10²³ atoms of magnesium = 24 g

\(\because\) 24 g of Mg contain 6.022 × 10²³ atoms

\(\therefore\) 0.1072 g of Mg will contain = \(\frac{6.022\times10^{23}\times0.1072}{24}\) = 0.0269 x 10²³

⁼2.69 × 10²¹ atoms