Molecular weight of A = Mass of one molecule of A/
This relationship can be given as follows. Relative atomic mass is the mass of an atom relative to the mass of Carbon-12 atom and it has no units. Molar mass of an element = Relative atomic mass x molar mass constant (g/mol) Molar mass of an element is given as below. This can be done simply by the addition of molar masses of each atom present. The molar mass of a molecule can be determined using atomic masses. These methods are discussed in detail below. Using the equation for calculating the molar mass.The molar mass of a substance can be calculated using several methods such as Therefore, the molar mass of H 2O is 18 g/mol. The total mass of 6.023 x 10 23 H 2O molecules is about 18 g. One mole of H 2O is composed of 6.023 x 10 23 H 2O molecules. Now we can apply this for real substances. Molar mass of compound B is the sum of masses of 6.023 x 10 23 B molecules.Molar mass of compound A is the sum of masses of 6.023 x 10 23 A molecules.One mole of compound B is composed of 6.023 x 10 23 of B molecules.One mole of compound A is composed of 6.023 x 10 23 of A molecules.To avoid confusion, take a look at the following example. Therefore, the molar mass can be given a new definition, that is, molar mass is the total mass of 6.023 x 10 23 atoms (or molecules) of a particular substance. It is a constant because no matter what the type of atom is, one mole of it is equal to that amount of atoms (or molecules). This number is called the Avogadro’s number. One mole of a substance is equal to a very large number, 6.023 x 10 23 of atoms (or molecules) which the substance is made of. Mole or mol is the unit used to measure the amount of a substance. Molar Mass = Mass of the Substance (Kg)/Amount of Substance (Mol) The molar mass can be calculated using the following equation. However, the SI unit for molar mass is kgmol -1 (or kg/mol). The most commonly used unit for the molar mass of a substance is gmol -1. Molar mass is the mass of a mole of a particular substance. Key Terms: Avogadro’s Number, Boiling Point, Calusius-Clapeyron, Cryoscopic Constant, Ebullioscopic Constant, Freezing Point, Melting Point, Molality, Molar Mass, Molecular Weight, Osmotic Pressure, Relative Atomic Mass What is the Importance of Knowing the Molar Mass of a Substance – Definition, Equation for Calculation, Explanationģ. Some of these major methods will be discussed concisely in this article. Some of these methods include using the direct equation, adding the atomic masses of different elements in a compound, and using boiling point elevation or freezing point depression. There is more than one method to calculate the molar mass. It is very useful in analyzing, comparing and predicting the other physical and chemical properties such as density, melting point, boiling point, and the amount of substance that react with another substance in a system. Molar mass is a physical property of substances.
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