The Ideal Gas Law

The Ideal Gas Law
The previous laws all assume that the gas being measured is an ideal gas, a gas that obeys them all exactly. But over a wide range of temperature, pressure, and volume, real gases deviate slightly from ideal. Since, according to Avogadro, the same volumes of gas contain the same number of moles, chemists could now determine the formulas of gaseous elements and their formula masses. The idea gas law is:
PV = nRT
Where n is the number of moles of the number of moles and R is a constant called the universal gas constant and is equal to approximately 0.0821 L-atm / mole-K.
Partial Pressures
Dalton s Law of Partial Pressures states that the total pressure of a mixture of nonreacting gases is the sum of their individual partial pressures.
Ptotal = Pa + Pb + Pc + ...
or
Ptotal = naRT / V + nbRT / V + ncRT / V + ...
or
Ptotal = (na+ nb+ nc+ ... )RT / V
Non –Ideal Gases:
The ideal gas model is an approximate model of gases that is often used to simplify calculations on real gases. An ideal gas has the following properties:
1. There are no intermolecular forces between the gas particles.
2. The volume occupied by the particles is negligible compared to the volume of the container they occupy.
3. The only interactions between the particles and with the container walls are perfectly elastic collisions