In some cases, values for molarity and molality of a solution are very close. Unlike molarity, molality is the ratio of the amount of substance of the solute to the mass of the solvent, and not to the mass of the entire solution. We have to be careful not to confuse molarity with another related property, molality. Molar concentration is also sometimes called molarity. We can also use moles to measure other particles such as molecules or electrons, but we would need to specify which particles are in use in this case. The elementary particles most commonly used when working with moles are atoms. Otherwise, we would need to use either very large numbers or very small quantities (for mass or weight) that are hard to work with and impossible to measure using currently available measuring devices. Moles are very convenient to use for substances that are in quantities small enough, that can be easily measured using household or industrial measuring devices. One mole is defined as the number of atoms in 12 grams of carbon-12, which is about 6×10²³ atoms. Because there are vast numbers of elementary entities even in a small volume of a substance, we use special units called moles for the amount of substance. Here the amount of substance is measured as the number of elementary entities (e.g.

The substance in our case is the solute, while the volume is measured for the entire solution, even if it has other solutes in it. Here we consider molar concentration, which is measured as the ratio of the amount of substance in moles to the total volume of the solution. One mole of carbon is the amount of the substance that has the same number of atoms as in 12 grams of carbon-12, or more specifically 6×10²³ atoms.Ī concentration of a solution can be measured in different ways, for example by measuring the ratio between the mass of the solute and the total volume of the solution.

Moles to particles calculator