THE EMPIRICAL FORMULA (o-level chemistry)
THE EMPIRICAL FORMULA
The empirical formula of a compound is the simplest formula, which shows the ratio of the atoms present in a compound or a molecule by mass.
The molecular formula of a compound is the formula, which shows the number of each kind of atoms present in the compound.
TO CALCULATE THE EMPIRICAL FORMULAE
Example I
Sodium sulphate has the following composition by mass; sodium 32.4% sulphur 22.5% and oxygen 45.1%.
solution
Example 2
A compound contains oxygen and copper only. The molecular mass is 159.0.
What is its Empirical and molecular formula if the percentage of copper is 76
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CATEGORIES O-level chemistry
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