ACS Chemistry Practice Exam 2026 – The All-in-One Guide to Exam Success!

The main gas law equation is expressed as PV = nRT. This equation is known as the ideal gas law and describes the relationship between pressure (P), volume (V), the number of moles of gas (n), the ideal gas constant (R), and temperature (T) in Kelvin.

In this equation, each term plays a significant role:

- P represents the pressure of the gas, indicating how much force the gas particles exert on the walls of their container.

- V represents the volume of the gas, which refers to the space the gas occupies.

- n is the number of moles, a measure of the amount of substance present in the sample.

- R is the ideal gas constant, which interrelates the units for pressure, volume, temperature, and amount of gas.

- T is the temperature of the gas in Kelvin, which reflects the average kinetic energy of the gas particles.

This equation is foundational in the study of gases because it links all the crucial properties together, allowing scientists and chemists to predict the behavior of gases under varying conditions. It applies specifically to ideal gases, which behave according to the assumptions of the kinetic molecular theory.

The other choices do not accurately represent the ideal gas law. For example, the