Mole Concept | How to calculate Molar Mass ?

Key Points
The mole allows scientists to calculate the number of elementary entities (usually atoms or molecules) in a certain mass of a given substance.
Avogadro’s number is an absolute number: there are 6.022×1023 elementary entities in 1 mole. This can also be written as 6.022×1023 mol-1.
The mass of one mole of a substance is equal to that substance’s molecular weight. For example, the mean molecular weight of water is 18.015 atomic mass units (amu), so one mole of water weight 18.015 grams.
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