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Re: jpklma post# 2935

Monday, 08/06/2007 2:04:06 PM

Monday, August 06, 2007 2:04:06 PM

Post# of 16772
So one other thing I forgot. Even if the reaction is spontaneous, meaning that it does not require imput energy to occur, there's still the question of the *kinetics* of the reaction. If it's a fast reaction, then it will generate a lot of energy per unit of time. According to her theoretical description (which is always a liberal estimate, since reactions are never completely efficient in real life), one gram of hydrogen gas produced only releases 1.55 W per hour, (hardly any power at all). So .6666 grams of ammonia is needed to produce 1 gram of hydrogen gas. A problem with this is that, while .66666 grams of ammonia may seem like a small quantity, and one can say "we can easily use several kilograms of ammonia" (= several 1.55 KW/hr), the problem is that all this ammonia has to be dissolved in water. The amount of water necessary to dissolve several kilograms ammonia is more than what a gas tank can hold.

Also, water is heavy. It would take a lot of energy to haul around that much water.

Ok, well I'm open for discussion. Any scientists on board?