The combined-gas law best describes which of the following?
a. The behavior of all gases when volume is constant
b. The combined behavior of pressure, vol-ume, and temperature
c. The additive properties of individual gases occupying the same space
d. The macroscopic behavior of gases when any or all variables change simultaneously
ANS: D
The combined-gas law describes the macroscopic behavior of gases when any or all of the varia-bles change simultaneously. As such, the combined-gas law states that the absolute pressure of a gas is inversely related to the volume it occupies and directly related to its absolute temperature, or PV/T = nR.
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