Question

1.Given the following mole fraction and vapor pressures for miscible liquids A and B, calculate the composition (in mole percentage) of the vapor from a distilling an ideal binary solution at 150°C and 760 mmHg for the solution

X_A=0.50                        P_A=1710mmHg

X_B=0.50                        P_B=130mmHg

2. Define the following.

Refluxing

Dalton’s Law

Raoult’s Law

3. What is the mole fraction of each component if 4.0 g of benzene (C₆H₆) is dissolved in 6.4 g of toluene (C₇H₈)?

4. Consider the following solvent pairs. If mixed together, which pairs would form two layers? If they form two layers, which solvent would be on top?

Acetone and toluene

Methanol and hexanes

Hexanes and methylene chloride

Hexanes and water

5 .Chloroform is an excellent solvent for extracting caffeine from water. The distribution coefficient K_D=(C chloroform)/(C water) for caffeine in chloroform- water is 10 °C at room temperature. Find the mass of caffeine that would be removed from a solution 4.0 g of caffeine in 100ml of water using a single extraction of 100 ml of chloroform.

Answer 1

Q1.

if ideal:

XA=0.50                        PA=1710mmHg

XB=0.50                        PB=130mmHg

Ptotal = XA*PA + XB*PB = 0.5*1710 + 130*0.5 = 855 mm Hg

2. Define the following.

Refluxing --> process in which we re-incorporate the products from distillate/bottoms in order o tincreas epurity and increase mass transfer coefficient

Dalton’s Law --> the addition of partial pressure of each gas will give the total pressure of the gas mix

Raoult’s Law -- > the partial pressure of a gas is equal to the vapor pressure of its specie in the liquid phase

Please consider posting multiple questions in multiple set of Q&A. We are only allowed to answer to a single question per set of Q&A