Respuesta :
The molecular formula for hydrate has been, CaCl₂.2H₂O.
What is the molecular formula?
The molecular formula is given as the representation of the compound with the number of atoms of each element.
The hydrate has a mass of 4.72 g. The anhydrous has a mass of 3.56 g. The mass of water will be:
Mass of water = Mass of hydrate - Mass of anhydrate
Mass of water = 4.72 g - 3.56 g
Mass of water = 1.18 grams
The moles of calcium chloride in 4.72 grams are:
Moles = Mass/ Molar mass
Moles of Calcium chloride = 4.742 g / 110.98 g/mol
Moles of Calcium Chloride = 0.0321 mol
The moles of water in 1.18 grams are :
Moles of water = 1.18 g / 18 g/mol
Moles of water = 0.0655 mol
The ratio of calcium chloride to water in the compound will be:
Calcium chloride / water = 0.0321 / 0.0655
Calcium chloride / water = 2 / 1
Thus, the molecular formula for hydrate has been, CaCl₂.2H₂O.
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