P1 x V1 = P2 x V2

P = pressure

V = volume

In Boyle's Law, the volume of the gas varies inversely with the pressure.

A sample of carbon dioxide occupies a volume of 3.5 liters at 125 kPA pressure. What pressure would the
gas exert if the volume was decreased to 2 liters?

(3.5)(125) = (2)(P2)

437.5 = 2x

x=218.75

__Charles' Law__

V1/T1 = V2/T2

In Charles' Law, the volume of a fixed mass of the gas is directly proportional to its Kelvin temperature.

A sample of nitrogen occupies a volume of 250 mL at 25 degrees Celsius. What volume will it occupy at 95 degrees Celsius?

.25/298 = x/368 *

298x = 92

x= .308

* don't forget to convert to Kelvin! Celsius + 273 = Kelvin