Formula for hydrate

Question

What is the formula of a CoCl2 hydrate if it contains 45.43% water.

Answer 1

The formula for the hydrate would be CoCl₂ ∗ XH₂O

molar mass CoCl₂ = 129.8 g / mol

molar mass H₂O = 18.02 g / mol

molar mass of hydrate = 129.8 g + (18.020(X)g

(18.02 g / mol)(X mol) / 129.8 g + (18.020(X)g = 0.4543

X = 6 mols H₂O

Formula for the hydrate = CoCl₂ ∗ 6H₂O