Molar Mass
Calculate the molar mass, the amount of substance in mol and the mass. The molar mass is the ratio of mass and amount of substance. The unit of mass is the gram, or units derived from it such as kilograms. The unit for the amount of substance is mole. One mole is 6.02214076 * 1023 particles, just over 600 sextillion. This value is the Avogadro constant, at which the mass of the substance corresponds to the atomic mass (see below). Please enter two of the three values M, m and n, the other value and the amount of particles will be calculated.
molar mass = mass / amount of substance, M = m / n
g = gramms, mg = milligrams = 1/1000 g, kg = kilograms = 1000 g
mmol = millimol = 1/1000 mol, kmol = kilomol = 1000 mol
Example: the molar mass of water is 18.015 g/mol. So 200 grams of water have 11.102 mol or 6.686 * 1024 particles of H2O, these are almost seven septillion.
The Italian physicist Amedeo Avogadro discovered in 1811 that the same volume of different ideal gases contains the same number of particles. In 1909, the Avogadro constant was named after him, after the number of particles in one mole. The mole is only defined for pure substances, i.e. for quantities that consist of only one type of molecule or atom. A mole is the number of particles whose mass in grams corresponds to the atomic mass of the molecule or atom contained. One mole of the most common carbon isotope C 12 has exactly 12 grams. This particle was used to define the atomic mass unit u and it is also used in the current definition of the mole from 2019. A mole of carbon in its usual isotope mixture, on the other hand, has about 12.1 grams, as it also contains small amounts of C 13. One mole of cholecalciferol or vitamin D3, C27H44O, has a molar mass of 384.64 grams per mole. If you know the molecular formula of a molecule, you can calculate the molecular mass here. The mole is the SI unit of the amount of substance, and can also be given the usual prefixes such as kilo- and milli-.
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