What is the % by mass of H2O in Ba(OH)2 * 8H2O

Ba(OH)2 * 8H2O is called barium hydroxide octahydrate. It is a solid compound. What is the % by mass of H2O in Ba(OH)2 * 8H2O?

Calculate the molar mass of Ba(OH)2 * 8H2O

The molar mass contains 1 mole of Ba  (137g)

                   2mole of O    (32g)

                   2mole of H     (2g)

                    8 mole of water ( 8 x 18g)

The total mass is the sum of the masses of the components above;

 

% composition =  mass of the part / mass of the whole x 100

In this case

                   % water =   mass of the 8 moles of water / molar mass of Ba(OH)2 * 8H2O    x  100

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