How many moles of so2 are in 745 l at stp?

One mole of any gas at stp would be about 22 liters, so you would simply have to change the order of the question to make it easy to answer. 
745 liters/ 22 liters = around 34
So, there are about 34 moles of SO2 in 745 liters at STP.
Hope this helps.

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