When 25 g of a non-volatile solute is dissol | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) Given:Weight of non-volatile solute, $w = 25 \ g$Weight of solvent, $W = 100 \ g$Lowering of vapour pressure, $p^{\circ} - p_s = 0.225 \ mm$Vapour

Vedclass · Accepted Answer

$350$

Vedclass · Answer

(C) Given:Weight of non-volatile solute, $w = 25 \ g$Weight of solvent, $W = 100 \ g$Lowering of vapour pressure, $p^{\circ} - p_s = 0.225 \ mm$Vapour pressure of pure solvent, $p^{\circ} = 17.5 \ mm$Molecular weight of solvent $(H_2O)$, $M = 18 \ g/mol$Molecular weight of solute, $m = ?$According to Raoult's law for non-volatile solutes:$\frac{p^{\circ} - p_s}{p^{\circ}} = \frac{w 	imes M}{m 	imes W}$Substituting the values:$\frac{0.225}{17.5} = \frac{25 	imes 18}{m 	imes 100}$$m = \frac{25 	imes 18 	imes 17.5}{0.225 	imes 100}$$m = \frac{25 	imes 18 	imes 17.5}{22.5}$$m = 350 \ g/mol$

When $25 \ g$ of a non-volatile solute is dissolved in $100 \ g$ of water, the vapour pressure is lowered by $2.25 \times 10^{-1} \ mm$. If the vapour pressure of water at $20^{\circ}C$ is $17.5 \ mm$, what is the molecular weight of the solute?

Similar Questions

Among acetone,ether,and ethanol,which one will have the maximum and which one will have the minimum vapor pressure?

At $T \ K$,the vapour pressure of water is $x \ kPa$. What is the vapour pressure (in $kPa$) of a $1 \ m$ (molal) aqueous solution containing a non-volatile solute (in $x$)?

The vapour pressure of pure water is $23 \text{ mmHg}$. The vapour pressure of an aqueous solution, which contains $10$ mass per cent of solute '$A$' having molecular weight $50$ is (in $\text{ atm}$)

Vapour pressure of a solution and of a pure solvent are $P_1$ and $P_1^0$ respectively. If $\frac{P_1}{P_1^0}$ is $0.15$,find the mole fraction of the solute.

At $300 \ K$,the vapor pressures of two pure liquids $A$ and $B$ are $150 \ mm \ Hg$ and $100 \ mm \ Hg$,respectively. If the mole fractions of $A$ and $B$ in the solution are equal,then the mole fraction of $B$ in the vapor phase at the same temperature is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module