Mass/molar mass can be defined as the smallest unit of mass of any compound and is the twelfth of one carbon mass- 12 atoms. Read on to find more.
Have you ever wondered what the exact number of molecules present in a football you are playing with or the water you are drinking is? We know by now that atoms or molecules are the smallest units when considering both mass and size. The weight of one sample mole is the molar mass. The molar mass is calculated by adding all the atomic masses of each and every atom in a molecule. How can molar mass be defined then?
The molar mass of any substance is defined as the smallest mass unit of that compound with one-twelfth of the mass of one carbon that would be 12 atoms. In any substance, the number of entities present can always be defined as a mole.
You can take the standard unit to be g mol⁻¹ and the SI one as kg mol⁻¹. The number of atoms that is observed in 12g of 12C isotope is the number of particles you would also observe in 1 mole of the substance. Remember, no matter the substance, the mole of any substance would always contain the same entity number.
A spectrometer was used to measure the mass of carbon-12 atoms, and it was found to be 1.992648x 10⁻³g. The number of entities in one mole is crucial while calculating the mass in chemistry and is known as the Avogadro number, which is 6.02214076 x 10²³.
It might seem easy to calculate the formula masses of molecules, atoms, and other such compounds; however, finding individual weights of these particles does not serve any useful purpose. They should be expressed at a more macroscopic level, and the bridge between this particulate and the macroscopic level is considered as the molar mass.
Molar mass = mass/mole = g/mol
Let us take an example to understand how to calculate the molar mass of NaCl.
1. Is mass equal to molar mass?
Molar mass is considered to be the same as the formula mass.
2. What is meant by molar mass?
Molar mass can be defined as the smallest unit of mass of any compound and is the twelfth of one carbon mass- 12 atoms.
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