Question

PVT relationship is based on an ideal gas law where PV=nRT..but it is highly unlikely for a substance to behave ideally..thus other correlations has been introduced such as Van der Waals equation, Cubic EOS and Virial EOS.

In less than 300 word discuss the assumption made for these equation and on what cases they most likely to be used. (can relate to HYSYS lab also)

Answer 1

In ideal gas case we assume that there is no intermolecular forces of attraction between the molecules and also there is negligible pressure acted by molecules on to the walls of container but in case of real gas there is intermolecular forces of attraction between the molecules and also extra pressure has to be accounted for the real gas, in spite of these, in case of ideal gas law we assume that volume occupied by gas in negligible with respect to the container but in real gas the actual volume would be somewhat less due to the volume occupied by gas molecule also.

These are the factors which is incorporated into real gas equations like van der waal,virial equation etc to predict the real gas system variables.