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?
Fri, 2012-04-27 11:18
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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