Question

Describe the limitation of the equation pv=rt

Answer 1

before describing the limitation of ideal gas equation, you should know, there is nothing in the entire universe that can be said ideal. ideal is hypothetical phenomena.

let's come to the point, there are mainly two limitation of ideal gas equation, PV = nRT.

• volume of gaseous molecules is assumed to be zero. as we know, gaseous molecule is defined particle , it can't be zero. yeah, of course its size is very small compare to vessel/container. this is an assumption that an ideal gas can be condensed to a volume of zero. but reality is, when we condense a real gas it just convert into another state (liquid) which have specific volume.
• two gaseous molecules never attract each other. but reality is, two gaseous molecules attract each other. even they loss kinetic energy after collision between two molecules.

Answer 2

Here is the answer:

1. Imagine that you condense an ideal gas. Since the particles of an ideal gas have no volume, a gas should be able to be condensed to a volume of zero. Reality check: Real gas particles occupy space. A gas will be condensed to form a liquid which has volume. The gas law no longer applies because the substance is no longer a gas!

2. Same scenario. We assume that gas particles are not attracted to each other. Reality check: Real gas particles are attracted to each other. As kinetic energy decreases as a gas is cooled, the particles will eventually move slowly enough that there attractive forces cause them to condense. The gas law no longer applies because the substance is no longer a gas!