# Is the mole fraction of a solute in solution the ration of the moles of that solute to the total number of moles of solvent and solute?

May 13, 2018

It may be....

#### Explanation:

${\chi}_{\text{the mole fraction"="moles of component"/"total moles in the solution}}$

And so we dissolve $1 \cdot g$ of sodium chloride in $100 \cdot g$ of water....

${\chi}_{\text{NaCl}} = \frac{\frac{1 \cdot g}{58.44 \cdot g \cdot m o {l}^{-} 1}}{\frac{1 \cdot g}{58.44 \cdot g \cdot m o {l}^{-} 1} + \frac{100.0 \cdot g}{18.01 \cdot g \cdot m o {l}^{-} 1}} = 0.0031$

And so necessarily ${\chi}_{\text{water"=1-chi_"NaCl}} = 0.997$