How many moles of oxygen are needed to burn 425 get of sulfur?

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moles S = 425 g / 32.066 g/mol=13.2 

the ratio between S and O2 is 1 : 1 

moles O2 required = 13.2 

Volume of O2 at STP = 13.2 mol x 22.4 L/mol=295.7 L

And a) oxygen i believe