How Do You Calculate The Number Of Moles? Explain With Example

One mole of any element or chemical compound is always the same number. One mole of hydrogen would mean there are 6.022 × 10 23 atoms of hydrogen. Molarity is also considered molar concentration because it is the measure of a concentration of a solution. Molarity is the number of moles of solute per litre of solution.

Number of moles = Mass of substance / Mass of one mole

Example: How many moles of sodium chloride is present in a sample that has a mass of 1.17g ?


The molar mass of Sodium Chloride = 2 3 + 3 5.5 = 5 8.5 g

No. of moles = Mass of NaCl / Molar mass of NaCl

= 1.17 /58.5

= 0.0 2 moles

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