Gas Laws

Gas Laws

1. Stoichiometry

   • Volume-Volume
     • Problems Involving the volumes of both known and unknown quantities
   • Mixed Mass-Volume-Mole-Particle
     • Find the unknown at STP
     • Then use 22.4mol=1L
   • Mass-Volume (Non-STP)
     • Use the proportions in chemical equations
     • Varied number of steps.

2. Combined Gas Laws

   • P1V1/T1=P2V2/T2
   • Charles' Law
     • V1/T1=V2/T2
     • Fixed pressure, temp/volume direct relationship
   • Boyle's Law
     • P1V1=P2V2
     • Fixed temp, volume/pressure inverse relationship.
   • Gay Lussac's Law
     • P1/T1=P2/T2
     • Fixed volume, temp/pressure direct relationship.
   • Combines Boyle's, Charles', and Gay Lussac's Laws.

3. Dalton's Law of Partial Pressures

   • Total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gasses
   • Pt=P1+P2+P3....
   • Partial Pressure over Water
     • P(t)=P(g)+P(h2o)

4. Ideal Gas Law

   • PV=nRT
     • R=0.0821Latm/molK
   • PV/nT=R
     • R=8.31kPadm^3/molK
   • For ideal gasses: PV/T and the number of moles is equal to a constant.

5. Graham's Law of Diffusion

   • Under the same conditions of T and P, gasses diffuse at rates that are inversely proportional to the square root of their densities.
   • D1/D2=(squrt)M1/M2