Mole Fraction Calculator

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Mole fraction is defined as the ratio between number of moles of one component to the total number of moles of all components in the solution. If there are two components say P and Q then the mole fraction is given by the formula

=

=


Example 1: 3.65gm of Hydro chloric acid is dissolved in 16.2g of water. (a) Find the mole fraction of water (b) Find the mole fraction of HCL

Weight of water = 16.2 gm and Molecular weight of water = 18

Number of moles of water = = = 0.9

Weight of HCL = 3.65 gm and Molecular weight of HCL = 36.5

Number of moles of HCL = = = 0.1

  1. Mole fraction of water =

= = = 0.9

  1. Mole fraction of HCL =

= = = 0.1
 

Example 2: A 12gm solute with a molecular weight of 30 is dissolved in 108 gm of water. Find the mole fraction of the solute and water.

Weight of water = 108 gm and Molecular weight of water = 18

Number of moles of water = = = 6

Weight of solute = 12 and molecular weight of solute = 30

Number of moles of solute = = = 0.4

  1. Mole fraction of water =

= = ≈ 0.94

  1. Mole fraction of Solute =

= = = 0.06

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