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Pride and Prejudice

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Increasing Moles and Mass

APPH12-5HTWNJ

A group of physics students studies the behavior of a gas by pumping air into a rigid 2.0 liter bottle and then measuring the increasing mass of the bottle with a digital scale. The students worked slowly and all pressure readings were taken with the gas at room temperature (293K). The five measurements are plotted on the graph above.

By what factor did the number of moles of gas in the bottle increase over the course of the five measurements?

A

factor of 2

B

factor of 25

C

factor of 100

D

The mass of the bottle increased because of the increased pressure, not an increase in number of moles.