Math wizard Posted July 29, 2012 Share Posted July 29, 2012 How many moles of Hydrogen are in H2O when H2O has a mass of 100? Link to comment Share on other sites More sharing options...
Iota Posted July 29, 2012 Share Posted July 29, 2012 How many moles of Hydrogen are in H2O when H2O has a mass of 100? I laughed when I saw your post's title 'Chemistry' under the 'Maths' forums. Chemistry could go in chemistry forums .<br class="Apple-interchange-newline"> 100g of 18gmol-1 H2O. 100/18= 5.56 mol H2O. (2/18)*100= 11.11% H by mass in H2O. (Because 2gmol-1 out of 18gmol-1 Water is Hydrogen.) (5.56/100)*11.11= 0.618mol H in H2O. (Times by the percentage of water made up by Hydrogen by mass equals ANS.) I'm confident this is the answer, but am doubting myself a bit, purely because it's been a while since I've done these sorts of chemistry calculations. It all seems to pan out, logically. Link to comment Share on other sites More sharing options...
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