Molar mass of hcl how to#

For all oxidizing and reducing agents (elements or compounds), the equivalent weight is the weight of the substance that is associated with the loss or gain of one mole (6.023 × 10 23) of electrons. For an element, the equivalent weight is the quantity that combines with or replaces 1.008 g of hydrogen or 7.9997 g of oxygen or, the weight of an element that is liberated in an electrolysis ( chemical reaction caused by an electric current) by the passage of 1 faraday (96,485.3321233 coulombs) of electricity.įor compounds that function as oxidizing or reducing agents (compounds that act as acceptors or donors of electrons), the equivalent weight is the gram molecular weight divided by the number of electrons lost or gained by each molecule-e.g., potassium permanganate (KMnO 4) in acid solution, 158.038/5 g potassium dichromate (K 2Cr 2O 7), 294.192/6 g and sodium thiosulfate (Na 2S 2O 3♵H 2O), 248.1828/1 g. Some equivalent weights are: silver (Ag), 107.868 grams (g) magnesium (Mg), 24.312/2 g aluminum (Al), 26.9815/3 g and sulfur (S, in forming a sulfide), 32.064/2 g. The equivalent weight of an element is its gram atomic weight divided by its valence (combining power).

The concept of equivalent weight has been displaced by that of molar mass, which is the mass of one mole of a substance. Substances react with each other in stoichiometric, or chemically equivalent, proportions, and a common standard has been adopted.

SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!Įquivalent weight, in chemistry, the quantity of a substance that exactly reacts with, or is equal to the combining value of, an arbitrarily fixed quantity of another substance in a particular reaction.

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Molar mass of hcl how to#

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