Answer:
Chemical formula is CoCl. 3H₂O
Explanation:
Data Given
Percentage of water = 45.43%
Percentage of CoCl. = 54.57%
Chemical Formula of the hydrates = ?
Solution:
First, find the mass of each of the part ( CoCl and water) in 100 g of the Compound.
Mass of CoCl = 28 + 35.5
Mass of CoCl = 63.5
Mass of H₂O = 18 g
Now find how many moles are there for each element in 100 g of compound
So,
The percentage will be count in grams for 100g in compound
Find the moles in total compounds
Formula Used for CoCl
mole of CoCl = mass of CoCl / Molar mass of CoCl
mole of CoCl = mole of 54.57 g / 63.5 g/mol
mole of CoCl = 0.859
Formula Used for H₂O
mole of H₂O = mass of H₂O/ Molar mass ofH₂O
mole of H₂O = 45.43 g / 18 g/mol
mole of H₂O = 2.539
Now
To find the Chemical formula
Divide each one by the smallest number of moles
CoCl = 0.859 / 0.859
CoCl = 1
For H₂O
H₂O = 2.539 / 0.859
H₂O = 3
Multiply the mole fraction to a number to get the whole number.
CoCl = 1
H₂O = 3
So,
The Chemical formula is CoCl. 3H₂O
