1.Given the following mole fraction and vapor pressures for miscible liquids A a
ID: 1062182 • Letter: 1
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
XA=0.50 PA=1710mmHg
XB=0.50 PB=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 KD=(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.
Explanation / Answer
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
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