Posted by kee on Thursday, July 14, 2011 at 5:09pm.
You made a typo. Propane is C3H8 (not C3H3). If it contains 14.8 moles C atoms, it must contain 14.8 x (8/3) moles H atoms. Another way to look at it is that if you had 14.3 moles C atoms, you must have had 14.3/3 moles C3H8 molecules (whatever that number is), then you had 8 times that value of H atoms.
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