Interpretation:
The formula and the name of this hydrate needs to be determined.
Concept introduction:
The relation between number of moles, mass and molar mass of a substance is represented as follows:
Here, m is mass and M is molar mass.
Answer to Problem 75PP
The chemical formula of the hydrate is
The name of the hydrate is Cobalt
Explanation of Solution
Given information:
The mass of hydrate of cobalt (II) chloride is 11.75 g. The number of anhydrous cobalt chloride remains after heating is 0.0712 mol.
Here, total mass of hydrated compound
Moles of Cobalt Chloride (anhydrous remaining)
Atomic mass of chlorine
Thus, molar mass of cobalt chloride will be:
Moles of Cobalt Chloride (anhydrous remaining)
Now, mass of
Total mass of hydrated compound
Also, mass of anhydrous compound
Therefore, amount of water in hydrate
Now, the number of moles of
Dividing by smallest number of moles,
Thus, the chemical formula is
Thus, the chemical formula of the hydrate is
Chapter 10 Solutions
Chemistry: Matter and Change
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