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AP® Chemistry

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Ideal Gases Have Relationship Problems Too

APCHEM-FKDDFX

Which of the following is TRUE for two states of an ideal gas?

A

${ n }_{ 1 }V_{ 1 }={ n }_{ 2 }{ V }_{ 2 }$

...where $n$ is the number of moles of gas, and $V$ is the volume of the gas.

Pressure and temperature are held constant in this transition.

B

${ P }_{ 1 }{ M }_{ 2 }={ P }_{ 1 }{ M }_{ 2 }$

...where $P$ is the pressure of the gas, and $M$ is the molarity of the gas.

Temperature is held constant.

C

${ P }_{ 1 }{ T }_{ 1 }={ P }_{ 2 }{ T }_{ 2 }$

...where $P$ is the pressure, and $T$ is the temperature.

Volume and moles of gas are held constant.

D

$\cfrac { {P }_{ 1 } }{ { d }_{ 1 } } =\cfrac { { P}_{ 2 } }{ { d }_{ 2 } } $

...where $P$ is the pressure of the gas, and $d$ is the density of the gas.

In this transition, the gas remains the same, so its molar mass stays the same, and the temperature of the gas remains the same.