What volume would be occupied by 100.g of oxygen gas at a pressure of 1.50 atm and a temperature of 25'C?

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You need to use the PV=nrt.V=?T=25+273=298KP=1.5atmR= .0821n = (100g O2)(1 mol/ 32g O2) = 3.125 mol O2V(1.5) = (3.125)(298)(.0821)Solve for Volume and your done :)