Group+C


 * This will be the space for the third group's answers.**


 * This should include:**
 * The original posed question
 * The solution
 * A step-by-step walkthrough of how to solve the problem
 * Background history explaining the chemistry of the problem (i.e. when in nature or in industry does said reaction occur, who first discovered the reaction, what are some of the common concerns with the reaction, with references)
 * Any relevant media (graphic, sound clip, video clip, etc.) that can be used to bring life to the page


 * Authors:** Kelsey and Alex
 * Due:** 11/4/2010

(a) How many moles of H2 would be required to fill the Hindenburg? 200,000m^3 x 100cm^3/m^3 x mL/cm^3 x L/1000mL x mol H2/22.4L = 9.0x10^2 mol H2 (b) Assuming that the hydrogen came from the hydrolysis of water, how many coulombs would be required to fill the Hindenburg? 2H2+O2=2H2O hydrogen oxidized. oxygen reduced. 2 electrons transfer. 892.857molH2 x 2electrons/mol x 96,500/electron = 1.72 x 10^8C (c) Assuming that a standard wall plug of 60 Amps was used to conduct the hydrolysis, how long would it take to fill the Hindenburg? 172,321,40C x s/60C= 2.87 x 10^6 s (d) How much heat (in kJ) is released from the combustion of 1 mol of hydrogen gas? How many kJ were released from the Hindenburg when it burst? H2O heat of formation = -241.82KJ 892.857 mol H2 x -241.82KJ/mol H2O formed = -2.15 x 10^5 KJ (e) Was the burning of the Hindenburg exothermic or endothermic? Explain. The burning of the Hindenburg was exothermic because the explosion released a significant amount of energy to the evironment around it. (f) Was the burning of the Hindenburg a state function? Explain. No, the reaction could not be reversed, so was not a state function. (g) When the Hindenburg flew, was it performing any "work" in the thermodynamic sense? Why or why not? The Hindenburg didn't perform any work because it didn't operate on a reaction that could make work or produce heat.
 * The Hindenburg was an hydrogen filled Zeplin built by the Germans. It contained 200,000 cubic meters of hydrogen gas. **

[] (newsreel of the Hindenburg when it exploded)

(1)This particular reaction of hydrogen is possibly going into use for cars. Hydrogen fuel cells are hopefully a new entirely clean limitless fuel. The fuel would be technically limitless since the reaction is reversible unlike the fossil fuels currently in use. (2) The reaction was officially discovered by English chemist Watt in 1784.

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