1. Calculate the mass (in grams) of 12.47 L of oxygen, O2(g), at a pressure of 815 torr and a temperature of 22.5 ? Report your answer to THREE significant figures. Do not include units. The gas constant R = 0.082058 Latm/molK and 1 atm = 760 torr = 760 mmHg. 2. Calculate the density (in g/L) of chlorine oxide, Cl2O(g), at 21.9 and 2.08 atm. Report your answer to THREE significant figures. Do not include units. The gas constant R = 0.082058 Latm/molK and 1 atm = 760 torr = 760 mmHg.