The+Combined+Gas+Law.Bertino

The Combined Gas Law
The combined gas law was is a combination of Boyle's law, Charles's law, and Gay-Lussac's law. This equation works by always keeping one variable constant. Boyle's law says that pressure and volume and inversely proportions, Charles's law says that volume and temperature are proportional, and Gay-Lussac's law says that pressure and temperature are proportional.

This law states that the ratio between the pressure- volume constant and the temperature of a system remains constant.

The law is written as: where: P=pressure V=volume T=temperature k=constant

To use this equation you can use the equation where P1, V1, T1 are the initial pressure, volume, and temperature, and P2, V2, T2 is the different set of numbers.

If you have a container with a volume of 25mL, at 50 degrees C, and 2 atms. What volume would it have at 30 degrees C, and 1 atm? -First you have to change the temperature from celcius to kelvin by adding 273 so, 50+270= 323 degrees K and 30+273= 303 degrees K -Second you have to fill in the variables[ P1=2atm, P2=1atm, V1=25mL, V2= unknown, T1= 323 K, T2=303 K) -Third you have to transform the equation to find the missing variable(V2) __P1V1T2__ = V2 P2T1 -Fourth you have to fill the variables into the equation: __(2atm)(25mL)(303K)__ (1atm)(323) -Now all you have to do is calculate the final answer: V2= 47mL
 * Example Problem**:

This picture shows how each of the laws are related to one another. They all use the same variables.

Back to the Home Page