Question

The exact mathematical expression of Rault's law is :

• A. $\frac{P^0-P_s}{P^0}=\frac{n}{N}$
• B. $\frac{P^0-P_s}{P^0}=\frac{N}{n}$
• C. $\frac{P^0-P_s}{P_s}=\frac{n}{N}$
• D. $\frac{P^0-P_s}{P^0}=n\times N$

Answer 1

The correct option is A $\frac{P^0-P_s}{P^0}=\frac{n}{N}$

$\frac{P^0-P_s}{P^0}=\frac{n}{N}$

where $P^o$ = Pressure of the pure solvent.

$P_s$ = Pressure of the solution.

$n$ and $N$ are the moles of solute and solvent respectively.