Calculadora de Mol
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
n = m/M ; N = n·Nₐ
About this calculator
The Mole Calculator is a practical tool for converting between mass, amount of substance (moles), and number of particles in chemistry. It solves stoichiometry problems using the formulas n = m/M (where n is the number of moles, m is mass in grams, and M is molar mass) and N = n·Nₐ (where N is the number of particles and Nₐ is Avogadro's constant, approximately 6.022×10²³). The user can input two known values and obtain the third, or calculate moles from concentration and volume of a solution.
How to use: select the desired calculation type (mass to moles, moles to particles, etc.), enter the data in the corresponding fields, and click 'Calculate'. The result is displayed instantly. The calculator also allows working with different units, such as grams, kilograms, moles, and number of particles. It is ideal for chemistry students, lab technicians, and professionals performing stoichiometric calculations in daily work.
When to use: when preparing solutions of known concentration, when determining amounts of reactants in a chemical reaction, or when converting between mass and number of atoms/molecules. For example, calculate how many moles are in 50 grams of water (H₂O) or how many molecules are in 2 moles of CO₂. The calculator avoids manual errors and speeds up the learning and working process.
Cautions: make sure to use the correct molar mass for the substance, as incorrect values lead to wrong results. For solutions, check that concentration is in mol/L and volume in liters. Remember that Avogadro's constant is an exact number, but rounding may be necessary. Always double-check the units entered and the result obtained, especially in precision contexts like laboratories.
Frequently asked questions
What is a mole?
A mole is the SI unit for amount of substance. One mole contains approximately 6.022×10²³ elementary entities (atoms, molecules, ions, etc.), known as Avogadro's number.
How do I calculate the molar mass of a substance?
Molar mass is the sum of the atomic masses of all atoms in the molecular formula, expressed in g/mol. For example, the molar mass of water (H₂O) is 2×1.008 + 16.00 = 18.016 g/mol.
Can I use the calculator for solutions?
Yes, select the concentration and volume option. Enter the concentration in mol/L and volume in liters to get the number of moles of solute.
Does the calculator work with any mass unit?
Yes, you can input mass in grams, kilograms, milligrams, etc. The calculator automatically converts to grams before calculating moles.
What if I enter inconsistent values?
The calculator will display an error message. Check that required fields are filled and units are correct. For example, you cannot calculate moles without providing mass or number of particles.