A sample of oxygen gas has a pressure of 440 mmHg. When the pressure is increased to standard pressure, the volume decreases to 1500. mL. If the temperature remains constant, what was the original volume?

8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm