Calculating Molecules in Moles of Oxygen?

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cobrastrike
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How many molecules are in 23 moles of oxygen?

I don't get it, I know how to do other kinds like How many moles are there in 25 grams of water? and How many grams are in 4.5 moles of Li20? but I don't get it.

THANK YOU in advance
 
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I believe the conversion is:

1 mole=6.022 x 10^23 molecules