Given the equation #2H_2O -> 2H_2 + O_2#, how many moles of #H_2O# be required to produce 2.5 moles of #O_2#?

1 Answer
MeneerNask
Mar 24, 2016

From the equation you'll see that #2H_2O# gives #1O_2#

Explanation:

So every 2 molecules of water gives 1 molecule of oxygen.
This ratio (#2:1#) stays the same if we are talking about moles, because a mole is a set number of molecules (#~~6.02xx10^23#). This goes for any substance.
So to produce 2.5 moles of oxygen, you will need the double number of moles of water, i.e. 5 moles.

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