Last I heard, xenon was a gas, and that sure sounds like an awful lot of it - how much is left (on our planet)?
Seriously man.. 770kg shouldnt sound like "an awful lot of it" when you are asking about how much we have "on our planet." You do know how massive the atmosphere is, right?
Extracting a liter of xenon from the atmosphere requires 798000 joules of energy, and 770 kg of xenon is 131804 liters. So thats 104388768000 joules of energy.
(yes, I am shooting for "oh noes big number")
Thats equivalent to under 3 minutes of output of the typical (average American) coal plant that puts out 667MW.
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/3qm-or1DGhU/story01.htm
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