Chemistry Test

Enjoy my chemistry questions:

R=0.0821 L*atm/(mol*K) = 8.314 J/(mol*K)

For ammonia: a=4.17 atm*L²/mol² and b=0.0371 L/mol.

1. A dentist suspects his assistant bought the wrong kind of anesthetic. After checking the tanks in storage (where the gas is kept at STP), he found the density to be 1.98 g/L. Find the molecular weight of the gas using the ideal gas equation to confirm his suspicions that he has laughing gas (N₂O).
   
   
   
2. Carbon tetrachloride is a toxic greenhouse gas. For kicks and giggles, calculate the average speed of the molecules in a sealed flask of carbon tetrachloride at 200^oC.
   
   
   
   
3. Egads! The Pepsi factory in Chernobyl is gonna blow! There were 600. kg of carbonic acid in the soda there, and if it all decomposes into carbon dioxide, we will have an environmental nightmare. Find the volume of CO₂ that will enter the atmosphere to help your team of environmental scientists combat the disaster before it’s too late. Assume the warm Ukrainian summer creates STP conditions.
   
   
   
   
4. The environmental scientists have failed to stop the disaster, but hope is not lost! You have to provide enough evidence to shut down the Hummer division of General Motors. A Hummer can drive about 12 miles on one gallon of petrol. Assuming 220. grams of octane (C₈H₁₈) are combusted in 12 miles, calculate the volume of oxygen used by one gallon of gasoline in a Hummer. Assume the test is at STP.



5. In a special garage, Ozzy Osbourne stores a special mixture of gas for use during concert special effects. In this mixture, nitrogen molecules have an average speed of 800. m/s. An unknown gas used in “Crazy Train” has an average speed of 120. m/s at the same temperature. What is the molecular weight of the Crazy Train gas?

6. Due to allegations of sexual harassment, your French maid is suing you. Part of the evidence to support her case is an ammonia solution consisting of 17.56 grams of ammonia under 12.000 atmospheres of pressure in a 2.000 L bottle. To save your hide you have to somehow prove that the temperature of the room was not exactly 10.00^oC.
   
   
   
   
7. Your teenage daughter is dating Dave Mustaine of Megadeth. You must be thinking, “Dammit, where did I go wrong?” Have no fear, for Ronnie James Dio is here. He offered to rescue her by slicing Mustaine’s head off with his warrior sword from “Holy Diver.” After some careful persuasion, you convinced him to capture Mustaine and lock him up in a pressure chamber for which only you have the controls. Right now, Mustaine is shivering at STP. What say we crank up the temperature to 50^oC? Find the pressure that Megadeth’s guitarist will have to handle.