Three bulbs are filled with CH, CO, and Ne as shown in the picture. The bulbs are connected through pipes of zero volume. When the stopcocks are opened and the temperature is kept constant throughout, the pressure of the system is found to be _____ atm. (Nearest integer)
Correct answer:3
Standard Method
Given: for CH, for CO, and for Ne. Temperature remains constant and the connecting pipes have zero volume.
Find: The final pressure of the system.
Using Dalton's law:
Total volume:
Total pressure contribution:
Final pressure:
Thus, atm.
Adding the pressures directly as is incorrect because the gases are initially in different volumes. First use , then divide by the total volume.
Ignoring the total final volume is wrong. After opening the stopcocks, all gases occupy the combined volume , not their original separate volumes.
Using the identity of gases to change the calculation is unnecessary here. At constant temperature, the final pressure depends on the pressure-volume contributions, not on whether the gas is CH, CO, or Ne.
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