Respuesta :
The molecular formula for hydrate has been, CaClâ‚‚.2Hâ‚‚O.
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, CaClâ‚‚.2Hâ‚‚O.
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