Question

Bulb A is 100 mL and contains Helium at 1 atm. Bulb B is 500 mL and contains Argon at 2 atm. The bulbs are connected together by a valve. What is the pressure of gas A after the valves are opened? (assume constant temperature)

Answer 1

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Answer 2

The long way is easier to explain but there is a shorter route.
Long way.
He. Use PV = nRT and solve for n. Use any convenient T.
Ar. Use PV = nRT and solve for n. use same T.
Add n He to n Ar and plug into PV = nRT. use same T as before and for V use the combined volumes.