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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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