Quiz 3 - Summer 2015 printable pdf download

Quiz 3 - Summer 2015

QUIZ 3 – Summer 2015

NAME:____________________________________________________

You have one hour to complete this quiz. Answer ALL the problems below.

You may use a standard or scientific calculator, your class notes, and any lecture handouts. You MAY

NOT use a computer, laptop, or other Internet-connected device.

To receive full credit for calculated values, you MUST INCLUDE UNITS and RECORD THE ANSWER TO

THE APPROPRIATE NUMBER OF SIGNIFICANT FIGURES

Questions 1-8. Use the molar mass information and the vapor-liquid equilibrium curve for a mixture of propane

and pentane below to answer questions 1-8 .

Molar mass of propane = 44.10 g/mole

Molar mass of pentane = 72.15 g/mole

x, Mole Fraction of Propane in Liquid

The minimum number of stages required to reach at least 0.50 mole fraction of propane starting with a 0.10

mole fraction solution is:

a. 1

b. 2

c. 3

d. more than 3

e. need more information

2) True /False Distillation will allow you to reach a 0.95 or greater mole fraction solution of propane.

3) True /False Propane has a lower boiling temperature than pentane.

4) If you start with a solution that contains 765 moles of pentane and 235 moles of propane, the mole fraction of

propane in the solution

is __________________.

(reported to three significant figures)

5) If you start with a solution that contains 50.00 grams of propane and 50.00 grams of pentane, the mole

fraction of propane in the solution

is ___________________.

(reported to four significant figures)

6) If you start with a solution that contains 44.10 grams of propane and 72.15 grams of pentane, the mole

fraction of propane in the solution

is ___________________.

(reported to four significant figures)

7) If you have a liquid solution that is 0.30 mole fraction in pentane, the equilibrium concentration of pentane in

the vapor space is ___________________.

8) True /False The propane/pentane equilibrium system presented in the graph shows the presence of an

azeotrope.

Quiz 3 - Summer 2015