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A fuel cell is an electrochemical device that reacts hydrogen with oxygen from the air to produce water and DC electricity. A proposed application is replacement of the gasoline-fueled internal combustion engine in an automobile with a 100 kW fuel cell.
You are on a summer internship with a gas supplier planning to transport hydrogen to service stations for the use in cars powered by fuel cells. The hydrogen is to be transported in tube trailers, each of which has 10 tubes of length 10.5 m and a diameter of 0.56 m. Hydrogen in the tubes at 2600 psig and an average temperature of 298 K is discharged at service stations to a final pressure of 55 psig, Refueling each fuel-cell-powered automobile is estimated to require 40.0 kg of hydrogen.
a) You and your office-mate - an intern from a different university- have been asked to estimate the number of automobiles that can be refueled by one tube-trailer load of hydrogen. He does a very quick calculation and comes up with a value of 95 cars. Specualte how he did it and provide support for your speculation. What was his mistake?
b) Do the calculation using the SRK equation of state. Use the following correlation developed specifically for hydrogen:23 α=1.202exp(-0.3228Tr).
c) Do the calculation using the law of corresponding states.
d) In which of the three estimates would you have the greatest confidence, and why?
Use data from appendix iib in the textbook to calculate the equilibrium constants at 25 degrees Celsius for each of the following reactions:
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What is the vapor pressure (in torr) above a solution prepared by mixing 47.89 g of water, H2O, with 47.65 g of ethanol, C2H5OH, at 63.50 °C?
a stock solution is prepared by adding 21 ml of 1 m alcl3 to enough water to make 76 ml. what is the cl- concentration
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the world's estimated annual gas reserves in 2006 were 6124 trillion ft3 .The world rate of annual use was 105.5 trillion feet3. How long these reserves will last if the rate of use continues?
Compute the radius of a cesium ion in CsCl if the density is 3.97g/cm3 as well as it is assumed that the ions touch through the body diagonal of the unit cell.
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