Enter the mass flow rate and the molar mass into the calculator to determine the molar flow rate.

Molar Flow Rate Calculator

From Mass Flow
From Gas Volume Flow

Enter the mass flow and pick the substance.

Related Calculators

Molar Flow Rate Formula

The following formula is used to calculate the molar flow rate for a given mass flow rate and molar mass.

dot{n} = \frac{\dot{m}}{M}

Variables:

  • (dot{n}) is the molar flow rate (mol/s)
  • (dot{m}) is the mass flow rate (kg/s)
  • (M) is the molar mass (kg/mol)

To calculate the molar flow rate, divide the mass flow rate by the molar mass.

What is Molar Flow Rate?

The molar flow rate is a measure of the number of moles of a substance that pass through a given surface per unit of time. It is commonly used in chemical engineering and process engineering to quantify the flow of substances in processes such as chemical reactions, separations, and transport phenomena. The molar flow rate is particularly useful when dealing with reactions and processes where the number of molecules, rather than their mass, is the critical factor.

How to Calculate Molar Flow Rate?

The following steps outline how to calculate the molar flow rate.

  1. First, determine the mass flow rate ((dot{m})) of the substance.
  2. Next, determine the molar mass ((M)) of the substance.
  3. Finally, calculate the molar flow rate using the formula (dot{n} = frac{dot{m}}{M}).
  4. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Mass Flow Rate ((dot{m})) = 10 kg/s

Molar Mass ((M)) = 0.02 kg/mol