help@askiitians.com

+91-87964 74404

Grade 12th passPhysical Chemistry

40 grams of liquid A and 70 grams of liquid B are mixed together. If both are ideal solutions, calculate the vapor composition. p0A = 200 mm, p0B = 700 mm, МA = 56 gr mol-1, MB = 90 gr mol-1.

Vira Khairanti

7 Years agoGrade 12th pass

2 Answers

Soumendu Majumdar

7 Years ago

Dear Vira,Accordin

Soumendu Majumdar

7 Years ago

Dear Vira,

According to Raoult’s Law,

P_A= P⁰_A $\chi$ _A & P_B = P⁰_B $\chi$ _B where $\chi$ _A & $\chi$ _B are mole fractions of liquids A & B respectively.

Number of moles of A $=40\div56$ mol

Number of moles of B $=70\div90$ mol

Mole fraction of A $=(40/56)\div[(40/56)+(70/90)]$ $=0.47872340425$

Mole fraction of B $=(70/90)\div[(40/56)+(70/90)]$ $=0.52127659574$

You may round off the values such that $\chi$ _A + $\chi$ _B= 1 remains true.

Now using Raoult’s Law, If the total vapor pressure of the liquids be P then;

P = P_A + P_B

$=[(200\times 0.47872340425) +(700\times 0.52127659574)]$ mm

$=460.638297868$ mm

You may approximate it to 460.6 mm or any other relevant value as per your need.

Hope this helps!

regards,

Soumendu

Which of the following aqueous solutions remains neutral after
electrolysis

physical chemistry

0 Answer Available

Last Activity: 3 Years ago

In the reaction A + 2B ⇌ 2C, if 2 moles of A, 3 moles of B and 2 moles of C are placed in a 2 L flask and
the equilibrium concentration of C is 0.5 mol/L. The equilibrium constant (KC) for the reaction is.....and please tell how you know that the reaction is going forward .. imean how to calculate the reaction quotient ???

physical chemistry

1 Answer Available

Last Activity: 3 Years ago

True or false when an electron in ground state of hydrogen atom is excited with an energy that is greayer than e2-e1 but less than e3-e1 the electron will get excited n=2

physical chemistry

1 Answer Available

Last Activity: 3 Years ago

18 19 gram mixture of na2co3 and nahco3 on heating gives 2.2 gram CO2 gas find the percent nahco3 (by mass) in mixture

physical chemistry

1 Answer Available

Last Activity: 4 Years ago

A 100 cm cube solution of sodium carbonate is prepared by dissolving 8.653 g of salt in water the density of solution is 1.0816g per ml what are the molarity and molality of the solution.

physical chemistry

1 Answer Available

Last Activity: 4 Years ago

View all Questions