# How To Go From Molecular Formula To Empirical Formula The Moleculer Formula (MF) and the Empirical Formula

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## The Moleculer Formula (MF) and the Empirical Formula

MF indicates the actual number and types of atoms in the molecule. It can either be a proof formula or a simple multiplication of it. Mathematically, MF = (EF) n, where (n) is an integer. For example a CO2 molecule has one carbon atom bonded to two oxygen atoms. The formula (CO2) is the molecular formula of carbon dioxide. It represents the actual molecular structure of the compound.

The molecular formula may be the same as the empirical formula as in the case of CO2 or the EF coefficient. Thus a mole of glucose shows that a molecule of glucose, contains (6) carbon, (12) hydrogen and (6) oxygen atoms and its simple atomic weight ie EF is (CH2O). Thus the molecular formula of glucose (C6H12O6) is equal to (CH2O) or six times the empirical formula (CH2O).

It follows that the molecular formula of glucose is six times EF, obtained by MF= (E. F)n where (n) is an integer, and glucose n = 6.

Statistically,

n = MFweight

EF difficulty

For many molecules, MF and EF are the same, one example is formaldehyde (CH2O), ammonia (NH3) and methane (CH4).

A formula that gives only the relative number of each type of atom present in a molecule. In other words, the empirical formula does not give the actual number of atoms in the molecule. For example the molecular formula of benzene is C6H6. This formula shows that a benzene molecule has (6) carbon atoms and (6) hydrogen atoms. The ratio of carbon (C) to hydrogen (H) atoms in this molecule is 6:6 or 1:1. The empirical formula of benzene is therefore written as (CH).

Thus the empirical formula tells us what elements are present and the simple atomic ratio, but not necessarily the actual number of atoms present in the molecule.

Consider another example, the glucose molecule (C6H12O6) where the atomic ratio of C, H and O is 6:12:6 i.e. 1:2:1 The empirical formula of glucose is, therefore, (CH2O).

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