After 0.69 g of CoCl2⋅6H2O is heated, the residue has a mass of 0.333 g . Calculate the % H2O in the hydrate.
What was the actual number of moles of water per formula unit CoCl2?
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To calculate the percentage of water in the hydrate, we need to find the mass of water and the mass of the anhydrous compound.
Given:
Mass of the hydrated compound (CoCl2⋅6H2O) = 0.69 g
Mass of the residue (anhydrous compound) = 0.333 g
Step 1: Find the mass of water in the hydrate.
Mass of water = Mass of hydrated compound - Mass of residue
Mass of water = 0.69 g - 0.333 g
Mass of water = 0.357 g
Step 2: Calculate the percentage of water.
Percentage of water = (Mass of water / Mass of hydrated compound) × 100%
Percentage of water = (0.357 g / 0.69 g) × 100%
Percentage of water ≈ 51.74%
Therefore, the hydrate CoCl2⋅6H2O contains approximately 51.74% water.