<p>Container 1 has 1 liter of argon at a pressure of 1.77 atm
Container 2 has 1.5 liters of argon at .487 atm
what's the pressure when we connect them?</p>
<p>Do you just add them?</p>
<p>When you connect the two containers, the total volume is 2.5 liters. The pressure of argon from container 1 = 1.77 atm * 1/2.5 = 0.708 atm. The pressure of argon from container 2 = 0.487 atm * 1.5/2.5 = 0.292 atm. Total pressure = 1.000 atm.</p>