This **molarity calculator** estimates the molar concentration of a solution by using the mass, volume and molecular weight. You can read more on the molar concentration and how to calculate the number of moles for a solution below the form.

## How does this molarity calculator work?

This is a great chemistry tool for those who need to determine a solution’s molar concentration from the mass, volume and molecular weight. There are four components in the equation therefore there are four fields in the* molarity calculator*. To compute any of the elements in the molarity equation you need to input the other three and choose the desired measurement unit.

- Volume – expressed in either liters, milliliters or microliters;
- Mass – expressed in either grams, milligrams, micrograms;
- Molecular weight – expressed in g/mol
- Concentration – expressed in either molar, milimolar, micromolar, nanomolar, picomolar or femtomolar.

## What is the molarity?

This is the same with molar concentration and represents the concentration of a solute in a solution. It is defined as the number of moles in a solution. Unit of measurement : SI: [mol/L] The concentration may also be expressed in different fractions of the molar concentration such as mmol/L (mM), μmol/L (μM), nmol/L (nM), pmol/L (pM). Here are the conversions:

1 mol/L (M) equals to |

1,000 mmol/L (mM) |

1,000,000 µmol/L (µM) |

10^{9} nmol/L (nM) |

10^{12 }pmol/L (pM) |

## How to calculate the number of moles?

The number of moles represents the fraction: mass of the compound / molecular weight of the compound.

For example:

To convert grams to moles, the molecular weight of the solute is needed. From the periodic table the molar masses of the compounds will be extracted. For KMnO4:

Molar mass of K = 39.1 g

Molar mass of Mn = 54.9 g

Molar mass of O = 16.0 g

Molar mass of KMnO4 = 39.1 g + 54.9 g + (16.0 g x 4)

Molar mass of KMnO4 = 158.0 g

## What other calculations you can do with the molarity calculator?

- mass of a compound of a solution calculation:

Mass (g) = Concentration (mol/L) x Volume (L) x Molecular Weight (g/mol)

- volume of a solution calculation:

Volume (L) = Mass (g) / Concentration (mol/L) x Molecular Weight (g/mol)

- molecular weight of a solvent in a solution calculation:

Molecular Weight (g/mol) = Mass (g) / Concentration (mol/L) x Volume (L)

26 Mar, 2015 | 0 comments
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