While a 5.00 L flask containing 1.35 atm of gas A is joined with a 2.00 L flask containing 1.00 atm of gas B, and the stopcock between the flasks is opened, as well as the gases are allowed to mix thoroughly at constant temperature, Explain what is the resulting total pressure of gases in the now-joined flasks? Presume no reaction between the gases and that the gases behave ideally