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A tank utilized for storing liquefied natural gas (LNG) must be taken out of service as well as inspected. All the LNG that can be pumped out of the tank is removed. The tank then warms from its service temperature (~-200°F) to ambient temperature and 1 atm vaporizing all the gas, which can be assumed to be pure methane. Purging is accomplished in two steps. First liquid nitrogen is sprayed onto the tank floor. The nitrogen vaporizes as well as the cold nitrogen gas displaces the warm methane vapor in a piston-like flow until the nitrogen fills the tank. Once the methane has been displaced the nitrogen warms to ambient temperature. Air is then blown into the tank from a blower capable of 10,000 ft3 /min. The air mixes with the nitrogen rapidly as well as completely, so the concentration of air leaving the tank is the same as that in the tank. (The tank is well mixed.) Explain how many gallons of liquid nitrogen are required if the volume of the tank is 175,000 barrels? Explain how many cubic feet of air are required to increase the concentration of oxygen in the tank to 20% by volume? Explain how long must the air be blown into the tank to achieve this concentration?
When 36.5 mL of 0.585 M H2SO4 is added to 36.5 mL of 1.17 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate pH of this reaction.
If a 100.00 g sucrose solution has a boiling point of 101.5oC, how many moles of sucrose are in the solution. How many grams
Which of the following equations represents the proper net ionic equation for the complete neutralization reaction between the weak acid HClO2 (aq) and the strong base KOH (aq)?
Compute the molarity of the hydroxide ions (OH- )in a solution that has been made by adding 70.3 grams of barium hydroxide (Ba(OH)2) in H2O(water) and diluting the solution to a final volume of four litres.
How much heat is liberated at constant pressure if .889 g of calcium carbanate reacts with 43.9 ml of .756 M hydrochloric.
The addictive painkiller morphine, C17H19NO3, is the principal molecule in the milky jiuce that exudes from unripe poppy seed capsules. Calculate the pH of a 0.0227 M solution of morphine, given that Kb = 7.9E-7.
How much heat must be absorbed by the six pack to lower its temperature from 25.0C to 5.0C?
you have 100 ml graduated cylinder containing 50 ml of water. you drop a 154 g piece of brass d 8.56 gcm3 into the
And, of course, ammonia is a base so there will be some NH4+ in solution also. Assume that the concentration of unprotonated NH3 is 0.040 M. What fraction of the cadmium ions are in the form of Cd2+
Lithium iodide has a lattice energy of -7.3 times 10^2 kJmol and a heat of hydration of -793 kj/mol. Find the heat of solution for lithium iodide.
What mass of sucrose, in grams should be combined with 531g of water to make a solution with an osmotic pressure of 8.95atm at 315K
When multiple isoprene units are combined in the metabolic process they may lose their double bonds, but the branching is fairly characteristic of the group. How many isoprene units were incorporated in the following structure
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