Combined Gas Law

[Tai_Vuong_3I]

Can someone please briefly explain the combine gas law? How do we know when to use it?

[Annabelle Jeon 3K]

combined gas law is when we use PV = nRT to find a missing variable by setting two set of the same gaseous substances under different conditions equal to each other. Here are some example formulas:

P1V1/(n1*T1) = P2V2/(n2*T2)
P1V1 = P2V2

In the context of chem14b, I can see us having to use it for solving for work done for irreversible or reversible reactions. For example, you could use P1V1 = P2V2 if you're given the change in pressure and an initial volume for an irreversible reaction, to solve for the change in volume.

[Sarah Egan 3A]

Basically it describes how the pressure, volume, and temperature are related. The ratio between the products is a constant.

The formula is PV/T=k (where k is the constant)
or
P1V1/T1 = P2V2/T2 (to see how one property affects the others)


If you do the derivation from the three Law’s it can be useful to help understand