Ideal Gas Law

Highlights of Gases

·         Density is different (balloon simulation)

·         The molecules are far apart (cooling of balloon)

·         There is lots of movement (based on observations, molecules determine weight)

·         Diffusion (bumping into one another)

Ideal Gas Law                                                    Balloon                                                               

·         PV = nRT                                             

o   (P) Pressure                       Volume ^            Pressure (decrease) 

o   (V) Volume                        

o   (n) Moles of Gas              Volume ^            Add Molecules ^

o   (R) Gas Constant

o   (T) Temperature              Volume ^            Temp ^

PV = nRT              à           PV = R

nT = nT                                 nT

Pressure              Temp Change

P₁ = P₂                   P₁ = P₂

T₁ = T₂                   T₁ = T2

P = 32psi

T = 90^oF = 32.22^oC = 305.4K

     -20^oF = -28.89^oC = 244.3K

32psi      =        X

305.2K        244.3K

32psi * 244.3K = 305.2K * X          à           X = 25.6psi

                305.2K    305.2K