Molar concept and Mole concept
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Answer:
Mole Definition
To introduce the concept of a mole, first, we will talk about the Avogadro's number/constant which is equal to 6.02214076 × 1023
When we talk about the number of moles of a substrate we divide the number of total particles of a molecule/compound/atom by Avogadro’s constant.
Hence, 6.02214076×1023 molecules of an oxygen molecule (O2) will constitute one mole of oxygen & similarly 6.02214076×1023 atoms of carbon will constitute one mole of carbon. In other words, when we say one mole of a substance is present in a sample that means that 6.02214076×1023 number of that specific element is present in the sample.
What Is Molar Mass?
Related to the concept of moles, the molar mass of a substance refers to the total mass of one mole of a substance (i.e. molar mass = mass of one mole which is equal to 6.02214076×1023 number of particles of that substance ).
We will also talk about the relation between atomic mass and molar mass.
Atomic mass strictly refers to the mass of one single atom of an element and is expressed in Atomic Mass Units (u).
One atomic mass unit =1.9944235 × 10⁻23 g
One molar mass of an element would be the mass of one mole of that element’s atoms
So numerically, one molar mass = mass of (6.02214076×1023 * Atomic mass of that element).
What is Molecular Mass?
Molecular mass is used to define the mass of a single molecule of a compound.
So when we calculate the molecular mass of a compound such as methane or even dihydrogen we first see the number of different atoms bonding in the molecules and add the respective atomic mass units to give the molecular mass.
Molecular mass is expressed in terms of Daltons (Da) and 1 Da = 1 u