Well, you’ve just enjoyed your weekend, but now you have to get back to the world of science, and in particular the molar mass. Yes, you definitely need to know how to find molar mass. Definition The molar mass can be defined as the mass of one mole of any substance. As for a mole, that’s just the overall number of atoms in twelve grams of the carbon-12 isotope. That’s always a fixed number, often dubbed Avogadro’s number. As follows from this, the molar mass of any substance can be explained as the mass of Avogadro’s number molecules of the given substance. The molar mass is employed when it comes to calculating concentrations of a particular substance. By the way, atoms normally come with two or even three types of particles. Let’s recall them. They’re the neutron, the proton and finally the electron.