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Molecules and Atomicity

Substance A w...

Question

Substance A when dissolved in solvent B shows molecular mass corresponding to A_3.Calculate the vant Hoff factor?

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Solution

1. Formula for vant Hoff factor:

i = $\frac{n o r m a l m o l e c u l a r w e i g h t}{o b s e r v e d m o l e c u l a r w e i g h t}$

2. Let normal molecular weight of A be x g/mol

So observed molecular weight becomes 3x g/mol as molecule of A becomes A₃.

3. So, i = $\frac{x}{3 x} = \frac{1}{3}$

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