Question

calculate (i) the percentage of oxygen in lime stone
(ii) the percentage of sodium in washing soda​

Answer 1

Calculate:

I.the percentage of oxygen in lime stone

:•in limestone, 40% is calcium and the rest is carbon and oxygen.

(ii) the percentage of sodium in washing soda

:•From the chemical formula, washing soda contains 10 molecules of water. Hence, 62.9% of the water of crystallization in washing soda crystals.