A hydrate of barium chloride has the formula BaCl subscript 2 dot XH subscript 2 O.If a 1.055g sample of the hydrate contains 0.157g H2O, what is the "X" in the formula?

Answer 1

g BaCl2 (without the H2O) = 1.055-0.157 = 0.898

mols BaCl2 = grams/molar mass = ?
mols H2O = grams/molar mass = ?

Now find the ratio of 1 mol BaCl2 to that of H2O. The easy way to do that is to divide the mols BaCl2 by itself (which MAKES it 1.00), then divide the mols H2O by the same BaCl2 number. Round to a whole number and that will be x.

Answer 2

Thanks so much!

Answer 3

You should have obtained BaCl2.2H2O