Grams to moles calculator will help to convert grams to moles of a substance. Grams gives you the practical value and moles gives you the theoretical value. The formula to convert grams into moles is given as,

Grams to moles = $\frac{Mass}{Formula \ weight}$.

Plugin the mass of the substance in grams and formula weight of the substance into the gram to moles calculator to get the amount of substance in moles.

Grams to moles = $\frac{Mass}{Formula \ weight}$.

Plugin the mass of the substance in grams and formula weight of the substance into the gram to moles calculator to get the amount of substance in moles.

**Step 1 :**Jot down the given mass of the substance from the question.

**Step 2 :**From the periodic table, find the formula weight of the given substance.

**Step 3 :**Plugin the mass and the formula weight into the formula given and get the amount of substance in moles.

Below are some of the solved problems to help to to convert grams to moles of a substance.

### Solved Examples

**Question 1:**Determine the number of moles in 30 gram of KMnO$_{4}$.

**Solution:**

Given : Mass of KMnO$_{4}$ = 30 gram

Formula weight of KMnO$_{4}$ = 39.0983 + 54.938049 + 15.9994 $\times$ 4 = 158.034 g/mol

Mass of KMnO$_{4}$ in moles = $\frac{Mass}{Formula \ weight}$

Mass of KMnO$_{4}$ in moles = $\frac{30}{1580.34}$

Mass of KMnO$_{4}$ in moles = 0.0189 moles

**Question 2:**Determine the number of moles in 12 gram of FeCl$_{3}$.

**Solution:**

Given : Mass of FeCl$_{3}$ = 12 gram

Formula weight of FeCl$_{3}$ = 55.845 + 35.453 $\times$ 3 = 162.204 g/mol

Mass of FeCl$_{3}$ in moles = $\frac{Mass}{Formula \ weight}$

Mass of FeCl$_{3}$ in moles = $\frac{12}{162.204}$

Mass of FeCl$_{3}$ in moles = 0.0739 moles