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Thermodynamics

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A 1.00-L bulb of methane at a pressure of 10.0 kPa is connected to a 3.00-L bulb of hydrogen at 20.0 kPa; both bulbs are at the same temperature.
(a) After the gases mix, what is the total pressure?
(b) What is the mole fraction of each component in the mixture?

Every time I start to answer this question I always end up with a different answer and I can not pinpoint where I went wrong.

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