Note the correct spelling of celsius.
Use PV = nRT and for n use n = grams/molar mass. Don't forget T must be in kelvin. Also, note your typo. I'm sure you meant exerted and not excreted. We usually don't excrete oxygen.
determine the pressure that must be excreted on 200 grams of oxygen to contain it in a 2.oo l vessel at 30 degrees celcius
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