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Number of Moles Formula

Mole is a fundamental unit in chemistry to represent the amount of the chemical elements. One mole of any substance is equal to the Avogadro number which is given as 6.023×10^{23}. Mole can be used as a measure of the products in a chemical reaction. The unit is denoted as mol. If we know the mass and atomic weight of any substance, we can calculate the number of moles using the given formula,
Number of Moles Formula

Related Calculators
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Mole Fraction Calculator
 

Number of Moles Problems

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Examples problems for calculating the number of moles are given below:

Solved Examples

Question 1: Calculate the number of moles in 0.326g of barium hydroxide?

Solution:
 
Given measures are,
Mass of Ba(OH)2 = 0.326g
Mass of one mole Ba(OH)2 = 171g
Number of moles formula is given as,
Number of moles = $\frac{Mass\ of\ substance}{Mass\ of\ one\ mole}$

Number of moles = $\frac{0.326}{171}$ = 0.001906 mol

 

Question 2: Calculate the number of moles in 98g of MnO2?

Solution:
 
Given measures are,
Mass of MnO2 = 98g
Mass of one mole MnO2 = 86.94g
Number of moles formula is given as,
Number of moles = $\frac{Mass\ of\ substance}{Mass\ of\ one\ mole}$

Number of moles = $\frac{98}{86.94}$ = 1.127 mol

 

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