Chemistry Practice Problems Kinetic Molecular Theory Practice Problems Solution: You have an evacuated container of fixed volume an...

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Solution: 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.

Problem

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.

Solution

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.

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