Posted by jo on Monday, September 21, 2009 at 11:19pm.
First it isn't written
2H2 + O --> 2H2O but as
2H2 + O2 ==> 2H2O for the FORMATION of water.
Whereas, H2O ==> H2O isn't telling you how the water was formed from the elements.
You could have something like
H2O(l) ==> H2O(g) where l stands for liquid and g stands for gas.
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