1. At 60°F, freon-12 (dichlorodifluoromethane) has a vapor pressure of 72.4 poun
ID: 1087026 • Letter: 1
Question
1. At 60°F, freon-12 (dichlorodifluoromethane) has a vapor pressure of 72.4 pounds per square inch (1.0 atm = 14.7 psi). If I opened a pressure vessel containing liquid freon-12 and poured it into an open beaker in the lab how much liquid freon would remain when equilibrium is established? Explain.
2. The propane tank for my barbeque holds seven pounds of liquid propane (C3H8).
a. If the tank ruptured, what would be the size of the cloud of propane which forms?
b. If the cloud of propane mixed with just the right (stoichiometric) quantity of air, and ignited, the resulting reaction would produce 3 moles C02, 4 moles H20 and would have 20 moles N2 from the original air, for each mole of propane combusted. Assuming a final temperature of 1100°C, what would be the size of the resulting fireball in my backyard?
3. What is the equilibrium concentration of 1,1,2-trichloroethane in the air over a solution of 100 ppm? Provide answer in mg/cubic meters.
4. If 4 liters of 100 ppm 1,1,2-trichloroethane solution is aerated at 1 liter per minute, how long will it take to reduce the concentration by 99% (Assume all bubble reach equilibrium with TCE in the water)?
Explanation / Answer
1)
when the closed container is opened the pressure of the liquid is dropped from 72.4 psi to atmospheric pressure 14.7 psi and due to which the liquid will flow.
For example take a soda bottle when you open the bottle the preesure is released from the bottle and it tries to matches the atmospheric preeesure as a result of which the liquid can flow out of the system or can flow.
let the liquid volume be 100ml, let the liquid that spilled out volume is x,so the volume spilled out is:
(100-x)X(72.4-14.7)=xX14.7
x=34.167 ml
after the liquid have flown 34.176 ml the equilibrium will be attained.
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