Question
How is van’t Hoff factor related to molecular mass of the substance ?
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Answer
The van't Hoff factor is also defined as,
actual moles of particles in solution after
$ \begin{aligned} i & =\frac{\text { dissociation }}{\text { moles of formula units dissolved in solution }} \\
& =\frac{\text { formula mass of substance }}{\text { observed molar mass of substance }} \\
& =\frac{M_{\text {teeoretical }}}{M_{\text {obsened }}} \end{aligned} $
In case of nonelectrolytes, $i <1$.
In case of electrolytes, $i >1$. For example for $KNO _3$ and $NaCl , i =2$, for $Na _2 SO _4, CaCl _2, i =3$, etc.
actual moles of particles in solution after
$ \begin{aligned} i & =\frac{\text { dissociation }}{\text { moles of formula units dissolved in solution }} \\
& =\frac{\text { formula mass of substance }}{\text { observed molar mass of substance }} \\
& =\frac{M_{\text {teeoretical }}}{M_{\text {obsened }}} \end{aligned} $
In case of nonelectrolytes, $i <1$.
In case of electrolytes, $i >1$. For example for $KNO _3$ and $NaCl , i =2$, for $Na _2 SO _4, CaCl _2, i =3$, etc.
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