CHM 2045C Module Six Sample Exam     

 

Module Six Part H-1 Gas Density Problem                   3 points

Calculate the gas density of octane gas C8H18 vapor at STP?

 

 

 

 

 

 

 

 

 

 

 

 

Module Six Part H-2 Molecular Mass Determination Problem  2 points

Calculate the molecular weight of an unknown liquid that when vaporized at 99 oC and 755 torre , gave 125.0 mL of vapor with a mass of 0.673 grams .

 

 

 

 

 

 

 

 

 

 

 

 

Module Six Part I Effusion of Gasses Problem                   5 points

A sample of Nitrogen gas escapes through a tiny hole in 44.0 seconds.  An unknown gas escapes under the same conditions in 80.0 seconds.  Calculate the molecular mass of the unknown.