Question

Show with an example the difference between empirical &molecular formula. How are the two related ?

Answer 1

Molecular formula says how many atoms of each element are in a compound. While empirical formula are the simplest or most reduced ratio of elements in a compound.
The empirical formula contains the smallest possible whole no. s that describe the atomic ratio. Molecular formula is the actual formula of a compound.
For example:
Molecular formula for glucose is C6H12O6. Here the actual no. of atoms of each elements are written.
While the empirical formula would be (C6H12O6)/2 which gives C3H6O3 which on further simplification gives CH2O.
Molecular formula is based off empirical formula. Its calculated through this method: -
((molecular mass of compound/ empirical mass of compound)) *empirical formula.
So, going back to our glucose example, if the empirical formula is CH2O.. and the molecular mass of glucose is 6 times that of methanal, then we can multiply the no. of each atom in methanal to get glucose.
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Answer 2

Answer:

An empirical formula represents the simplest whole-number ratio of various atoms present in a compound. The molecular formula shows the exact number of different types of atoms present in a molecule of a compound.

Explanation:

The molecular formula of benzene is C,H.. Thus, the ratio of the numbers of carbon and hydrogen atoms in a molecule of benzene is 6: 6. The simplest ratio of these two numbers is 1 : 1. Hence, the empirical formula of benzene is C,H₁, i.e., CH.

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