### Molar concentration online. Calculation of molality and molarity

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Molar concentration

also called molarity, amount concentration or substance concentration, is a measure of the concentration of a solute in a solution, or of any chemical species, in terms of amount of substance in a given volume. A commonly used unit for molar concentration used in chemistry is mol/L. A solution of concentration 1 mol/L is also denoted as 1 molar (1 M).
The molar concentration is defined as the amount of a constituent (in moles) divided by the volume of the mixture.
The molecular weight of the solute - for example, for NaCl is 22.99 (molecular weight of Na)+35.44 (molecular weight of Cl), 23.99+35.45 = 58.44, thus, molecular weight of NaCl = 58.44
You can see molecular weight of chemical elements here (under the element's symbol)

In addition to online version, in Android app, you can calculate the molality of the solution. Molality, also called molal concentration, is a measure of the concentration of a solute in a solution in terms of amount of substance in a specified amount of mass of the solvent. This contrasts with the definition of molarity which is based on a specified volume of solution.

 Molecular weight of the solute Molar concentration M dM cM mM μM nM Volume of the mixture, ml

 Molar concentration Designation 10-1 dM 10-2 cM 10-3 mM 10-6 μM 10-9 nM 10-12 pM