Chemistry Calculators ▶ Molecular Formula Calculator
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Table of Content
Our Molecular formula calculator is exclusively programmed to calculate the molecular formula of a substance or compound based on its empirical formula.
In the context of chemistry:
“A particular expression displaying the exact number of the atoms that are present in a molecule of a compound or a substance is known as the molecular formula”
For example:
The following table shows formula of various compounds:
| Sr. #. | Name Of The Substance | Molecular Substance Formula |
| 1. | Glucose | \(C_{6}H_{12}O_{6}\) |
| 2. | Sodium Chloride | NaCl |
| 3. | Hydrogen Peroxide | \(H_{2}O_{2}\) |
| 4. | Methane | \(CH_{4}\) |
| 5. | Water | \(H_{2}O\) |
Let us go through the series of various steps that are crucial to find the molecular formula:
$$ \text{Molecular Formula} = n\left(\text{Empirical Formula}\right) $$
where;
$$ n = \frac{\text{Molar Mass}}{\text{Empirical Formula Mass}} $$
Note: Always keep in mind that the value of n is considered as a whole number and not any decimal number.
Here the empirical formula to molecular formula calculator also helps you to determine the accurate substance formula by using the same relation as mentioned above.
By having a look of the formula, you will notice that two variables are used in it which are as follows:
Molar Mass:
If we divide the mass of the sample substance by its amount, we will get the molar mass of that substance.
Mass Of The Empirical Formula:
The overall mass of the simplest whole number ratio atoms in the compound is known as the mass of the empirical formula.
Here you need to calculate the basic notations of the variables involved by converting them from grams to kilograms. In case you find it difficult, tap the conversion calculator for better outcomes.
This is the final step of all. What you need to do here is to put the values of the variables that are given. Once you put them, simplify until you get a whole number answer.
Let us solve a couple of examples straight away that will clear your concept in more depth.
Example # 01:
Empirical formula of a compound of the boron and hydrogen is \(BH_{4}\). Its molar mass is 31.2 g/mol. How to calculate the molecular compound formula?
Solution:
As we know that:
$$ \text{Empirical Formula Mass} = 10.811+1.008+1.008+1.008+1.008 $$
$$ \text{Empirical Formula Mass} = 14.843 g/mol $$
Now we have to find the value of n as follows:
$$ n = \frac{\text{Molar Mass}}{\text{Empirical Formula Mass}} $$
$$ n = \frac{31.2}{14.843} $$
$$ n = 2 $$
Finally:
$$ \text{Molecular Formula} = n\left(\text{Empirical Formula}\right) $$
$$ \text{Molecular Formula} = 2\left(BH_{4}\right) $$
$$ \text{Molecular Formula} = B_{2}H_{8} $$
The free empirical formula to molecular formula calculator is considered the most reliable way to find the molecular formula and is widely used by chemists worldwide. Let us guide you how to use it!
Input:
Output:
The free molecular formula calculator displays:
From the source of wikipedia: Chemical formula, Empirical formula, Condensed formula, Law of composition, Isotopes, Trapped atoms,
From the source of khan academy: Chemical reactions, Physical and chemical changes
From the source of lumen learning: Chemical Formulas, Structural Formulas v. Empirical Formulas, Formulas of Ionic Compounds, Polyatomic Ions
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