Question

How do you solve Ideal Gas Law problems?

Answer 1

The Ideal Gas Law is a comparison of the the Pressure, Volume and Temperature of a Gas based upon the amount either by mole value or density.

There are two basic formulas for the Ideal Gas Law

`PV = nRT` and `PM = dRT`

P = Pressure in Atmospheres
V = Volume in Liters
n = Moles of the Gas Present
R = The Ideal Gas Law Constant `0.0821 (atmL)/(molK)`
T = Temperature in Kelvin
M = Molar Mass of the Gas in `(grams)/(mol)`
d = Density of the Gas in `g/L`

If we were given a 2.5 mole sample of `H_2` gas at 30 C in a 5.0 L container, we could use the ideal gas law to find the pressure.

P = ??? atm
V = 5.0 L
n = 2.5 moles
R = `0.0821 (atmL)/(molK)`
T = 30 C + 273 = 303 K

`PV = nRT` can be rearranged algebraically to `P = (nRT)/v`

`P = ((2.5 mol)(0.0821 (atmL)/(molK))(303K))/(5.0 L)`

`P = 12.4 atm`

I HOPE THIS WAS HELPFUL.
SMARTERTEACHER