Combined Gas Law

We can extend this idea of equal volume of gases at the same T and P having the same number of molecules to determine the volume of one mole of any ideal gas at standard temperature and pressure (STP): T = 0.0°C, P = 1.00 atm.

One mole of ANY gas at STP occupies a volume of 22.4 L.

If 2.0 L of water reacts to form hydrogen gas and oxygen, how many liters of hyrdogen gas and oxygen gas will form?

 Hint: The answer is not 2L and 1L. Problem 2: An aerosol can at 1.5 atm, 25^oC. What is the pressure when heated to 450^oC ??

Use the equation, P₁V₁T₂ = P₂V₂T₁

Because V₁ = V₂, you can set up the problem like this......

(1.5 atm) (723K) = (P₂)(298K)

P₂= 3.6 atm