Avogadro’s law and Charles’s law describe a proportionality of the volume of a gas when the pressure is constant. Which describes the proportionality that allows these laws to be combined when describing a gas?

At constant pressure, Avogadro’s law says volume is directly proportional to the number of moles: increasing the amount of gas increases its volume. Charles’s law says volume is directly proportional to absolute temperature: heating the gas increases its volume. Therefore, the correct choice is C, which pairs volume directly proportional to moles with volume directly proportional to temperature.

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