Question

A 2.00 L flask containing 0.600 atm of gas A is connected to a 4.00 L...

A 2.00 L flask containing 0.600 atm of gas A is connected to a 4.00 L flask containing 0.600 atm of gas B, after which the valve between the flasks is opened so that the gases can mix and react according to the following reaction equation. If the theoretical yield is produced at constant temperature, the total pressure in the combined flasks should be...?

2A(g) + 3B(g) → A2B3(g)

(1) 0.100 atm (2) 0.200 atm (3) 0.300 atm (4) 0.400 atm (5) 0.500 atm

I keep getting the answer .4 atm but i know that the correct answer is .2 atm. An explanation would be helpful. Thanks in advance!

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