Question

explain briefly about non ideal gasses and also explain its graph?

Answer 1

Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. As mentioned in the previous modules of this chapter, however, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws. In this section, the reasons for these deviations from ideal gas behavior are considered.

One way in which the accuracy of PV = nRT can be judged is by comparing the actual volume of 1 mole of gas (its molar volume, Vm) to the molar volume of an ideal gas at the same temperature and pressure. This ratio is called the compressibility factor (Z) with:

Z=molarvolumeofgasatsameTandPmolarvolumeofidealgasatsameTandP=(PVmRT)measured(9.6.1)(9.6.1)Z=molarvolumeofgasatsameTandPmolarvolumeofidealgasatsameTandP=(PVmRT)measured

Ideal gas behavior is therefore indicated