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Mole Fraction Tutorial :

Formula :

Mole Fraction Formula

Example-1: 0.100 mole of NaCl is dissolved into 100.0 grams of pure H2O. What is the mole fraction of NaCl?


$$\frac{100.0\text{g}}{18.0\text{g}\;\text{mol}^{-1}}\;=\;5.56\text{mol of}\;H_2O$$

Add that to the 0.100 mol of NaCl = 5.56 + 0.100 = 5.66 mol total

$$\text{Mole fraction of NaCl}\;=$$


What is the mole fraction of the H2O?