Molecular Formula

The molecular formula is the true formula representing the total number of atoms of each element present in one molecule of a compound. It is entirely possible that two or more substances will have the same percent composition, yet be distinctly different compounds.

Molecular Formula is defined as "the formula that shows the actual number of each kind of atom in a molecule."

The Molecular Formula is calculated from the empirical formula when the molar mass is known.

$n=\frac{molar\quad mass}{mass\quad of\quad empirical\quad formula}$=

$=number\quad of\quad empirical\quad formula\quad units$

Often the molecular formula is the same as the empirical formula. If the molecular formula is not the same, it will be an integral multiple of the empirical formula.

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