Lab- Determine Molar Volume Of Volatile Liquid

Question 1

0.075 grams of condensed vapor is present when a student uses the Dumas method. The experiment was conducted at 70°C, 1 atm and the volume of the container is 0.045 L. What is the molar mass of the material?

Answer 1

46.9

Question 2

In the Dumas method, the volatile sample is heated. As the sample evaporates, air is forced out of the container until the entire container is filled with the vapor of the sample. True or false?

Answer 2

True

Question 3

When using the Dumas method to determine the molar mass of a volatile material, a student fails to wipe off the outside of the test tube. What will this do to their calculations?

Answer 3

The calculated molar mass will be too high

Question 4

While following the Dumas method, a student assumes that the contents of the container are the same temperature as the water bath. If this is not true, and the material in the container is cooler, how old is influence the calculations?

Answer 4

They calculated molar mass will be larger

Question 5

A volatile substance is one that forms a vapor only at high temperatures. True or false?

Answer 5

False

Question 6

The container filled with the vapor of the volatile material is then chilled to condense the vapor. The mass of the condensed liquid is equal to the mass of the gas left the container. True or false?

Answer 6

False