« previous next »

Author Question: At 99, the vapor pressure of water is 733 mm Hg. (a) At standard atmospheric pressure, what is the ... (Read 56 times)

acc299

  • Hero Member
  • *****
  • Posts: 569
on: Aug 23, 2018

At 99, the vapor pressure of water is 733 mm Hg.
  (a) At standard atmospheric pressure, what is the vapor pressure of a compound being
  steam-distilled at this temperature?
  (b) If the compound has a molecular weight of 180, how much water is required to distill 1.0 g
  of the compound?



Question 2

Suggest a reason why benzene steam-distills at the rate of 1 g/0.1 g H2O, but nitrobenzene dis
  tills at the rate of 1 g/4 g H2O.



abctaiwan

  • Sr. Member
  • ****
  • Posts: 355
Reply #1 on: Aug 23, 2018
Answer to Question 1

(a) Ptotal = P A + P B
If P A (water) is 733 mm and Ptotal is 760, then P B (the compound being distilled) is (760
733) or 27 mm.
(b) (wtA/wtB) = (P A/P B) x (MWA/MWB)
wtA = 1.0 x (733/27) x (18/180) = 2.7 g of water



Answer to Question 2

Benzene is more volatile (bp 80) than is nitrobenzene (bp 210).


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Approximately 500,000 babies are born each year in the United States to teenage mothers.

Did you know?

There are 60,000 miles of blood vessels in every adult human.

Did you know?

Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

Did you know?

According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

Did you know?

There are more bacteria in your mouth than there are people in the world.

The discovery of aquaporins, water channels made of a transmembrane protein. The discovery of aquaporins, water channels made of a transmembrane protein.
Turn head for access to suboccipital muscles and locate TrPs. Use fingers or thumb to apply pressure ... Turn head for access to suboccipital muscles and locate TrPs. Use fingers or thumb to apply pressure ...
5-4 The relationship between vapor pressure and temperature—in this case for water. As the ... 5-4 The relationship between vapor pressure and temperature—in this case for water. As the ...
What is the molarity of KCl in sea water if sea water is 12.5% (m/m) and the den What is the molarity of KCl in sea water if sea water is 12.5% (m/m) and the den
Physics - Density, Pressure, and Pascal's Principle Physics - Density, Pressure, and Pascal's Principle
Video: Natural Selection, Species Isolation and Real World Example

For a complete list of videos, visit our video library