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jess: the second. The atomic masses given in the periodic table correspond to the mass of 1 mole of the monatomic substance. So, for I2 its 253.809. Same for H2, Cl2, etc.
edit: because i'm a nerd, and a pure monatomic thing can't really be a compound.
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Last edited by pig; 07-02-2006 at 03:00 PM..
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