Overtime some of the gas molecules will collide and condense into a liquid, while some gas molecules will combine together into larger gas molecules. This decreases the number of moles of gas.
You have an evacuated container of fixed volume and known mass and introduce a known mass of a gas sample. Measuring the pressure at constant temperature over time, you are surprised to see it slowly dropping. You measure the mass of the gas-filled container and find that the mass is what it should be--gas plus container--and the mass does not change over time, so you do not have a leak.
Suggest an explanation for your observations.
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What scientific concept do you need to know in order to solve this problem?
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