Section 1: Calculating the Mole Fraction

If you know how many moles of a component are present and the total number of moles present, you can find the mole fraction of the component.




A powder contains 0.6342 moles of Glucose and 0.3279 moles of Sucrose. What is the mole fraction of Sucrose to 3 decimal places?

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The mole fraction of Sucrose is 0.341.
Mole Fraction of Component A =               Number of Moles of A            
Total Number of Moles of All Components
Mole Fraction of Sucrose =          0.3279       
0.3279 + 0.6342

Mole Fraction of Sucrose = 0.3408 = 0.341 to 3 dec pl