The equation given is 2SO2(g)+O2(g)->2SO3(g),

and if 224L/h of O2 (at standard temp and pressure) is consumed by the reaction,

how much power is produced?

I can't go further than P=Work/Time and Work=P times change in V

I've tried 224x2-224x3/60^2 but that's not the answer :( The answer is 550W. No idea how.
Some help would be much appreciated!