Vapour pressures of pure liquids A and B are | vedclass

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

Question

(B) Calculate the theoretical vapour pressure using Raoult's law: $P_{	ext{calc}} = X_A P^{\circ}_A + X_B P^{\circ}_B = 0.1(300) + 0.9(800) = 30 + 72

Vedclass · Accepted Answer

$\Delta H_{	ext{mix}} < 0$

Vedclass · Answer

(B) Calculate the theoretical vapour pressure using Raoult's law: $P_{	ext{calc}} = X_A P^{\circ}_A + X_B P^{\circ}_B = 0.1(300) + 0.9(800) = 30 + 720 = 750 \ torr$. Since the observed pressure $P_{	ext{obs}} = 720 \ torr$ is less than $P_{	ext{calc}} = 750 \ torr$,the solution shows negative deviation from Raoult's law. For solutions showing negative deviation,the intermolecular forces between $A-B$ are stronger than those between $A-A$ and $B-B$. Consequently,$\Delta H_{	ext{mix}} < 0$ and $\Delta V_{	ext{mix}} < 0$.

Similar Questions

Which of the following mixtures is a non-ideal solution?

Liquids $A$ and $B$ form an ideal solution. Which of the following statements is true?

Which from the following liquid mixtures behaves nearly as an ideal solution?

$1 \, \text{mole}$ of liquid $A$ and $2 \, \text{mole}$ of liquid $B$ form a solution with a vapor pressure of $38 \, \text{torr}$. If the vapor pressures of pure $A$ and pure $B$ are $45 \, \text{torr}$ and $36 \, \text{torr}$ respectively,the solution will be:

Which of the following are correct for an ideal solution?
$(a) \Delta V_{\text{mix}} = 0$
$(b) V_{\text{solvent}} + V_{\text{solute}} = V_{\text{solution}}$
$(c) \Delta H_{\text{mix}} = 0$
$(d) H_2O + CO_2 \rightarrow H_2CO_3$ is an example of an ideal solution.

Vedclass Test Series

Exam Paper Generator

Online Exam Module