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What is the combined gas law? When do you apply it?

The combined gas law is P1V1 / T1 = P2V2 / T2, and is is a relationship between changing pressure, volume, and temperature for gasses. This law can be used for problems where pressure, volume, and temperature all change rather than one of them staying constant.

Chemistry 101

Chapter 11

Pressing Matter

Section 6

Combined Gas Law

Intro to Chemistry

Composition

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State the ideal gas law.

this question asks you what is the combined gas law? So it takes into account your understanding of a lot of the gas laws that were introduced to use, such as Charles Law and Boyle's Law, and combines them into a single gas law. The combined gas law states that pressure times volume divided by temperature, will be equal to a constant. So that means the pressure of a gas under one set of conditions multiplied by its volume divided by its temperature, will be equal to the pressure of the gas under the second set of conditions multiplied by its volume, divided by its temperature. Because both of these are equal to the same constant. So you would use this combined gas law when you have a gas under one set of conditions and you have one of the three and you have one or more of the three variables changing. Typically one or two variables changing. You could have a particular, uh, a nen initial pressure volume and temperature, and then maybe the pressure changes to a new pressure. The temperature changes to a new temperature, and you're asked to calculate the new volume or, you know, the initial pressure, volume and temperature of the gas and the pressure take changes to a set value and the volume changes to a set value and you're asked to solve for the new temperature.

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