Posted by Anonymous on Friday, March 5, 2010 at 9:46pm.
1.8 g H2O x (1 mol/18g) = 0.1 mol H2O. There are two moles H per mol H2O; therefore, 0.2 mol of H atoms.
0.2 x (1 g H/1 mol H) = 0.2 grams H needed.
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