Which one of the following is the incorrect f | vedclass

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(D) According to Raoult's law for a solution containing a non-volatile solute,the relative lowering of vapour pressure is given by: $\frac{P^o - P_s}{

Vedclass · Accepted Answer

$\frac{P^o - P_s}{P_s} = \frac{n}{n + N}$

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(D) According to Raoult's law for a solution containing a non-volatile solute,the relative lowering of vapour pressure is given by: $\frac{P^o - P_s}{P^o} = \frac{N}{n + N}$.From this,we can derive other forms:$1$. $\frac{P^o - P_s}{P^o} = \frac{N}{n + N} \implies \frac{P^o}{P^o - P_s} = \frac{n + N}{N} = \frac{n}{N} + 1$. This matches option $A$.$2$. $\frac{P^o - P_s}{P_s} = \frac{n}{N}$. This matches option $C$.$3$. Option $D$ is $\frac{P^o - P_s}{P_s} = \frac{n}{n + N}$,which is incorrect because the denominator should be $N$ (moles of solute) instead of $n + N$ (total moles).$4$. Option $B$ is $\frac{P_s}{P^o} = \frac{n}{n + N}$,but the given option $B$ is $\frac{P_s}{P^o} = \frac{N}{n + N}$,which is also incorrect. However,in the context of standard chemistry problems,option $D$ is the most commonly cited incorrect form.

Which one of the following is the incorrect form of Raoult's law?

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