Question

A real gas will behave most like an ideal gas under conditions of ________.

Answer 1

Answer: high temperature and low pressure

Explanation:

The Ideal Gas equation is:  

$P.V=n.R.T$  

Where:  

$P$ is the pressure of the gas  

$V$ is the volume of the gas

$n$ the number of moles of gas  

$R=0.0821\frac{L.atm}{mol.K}$ is the gas constant  

$T$ is the absolute temperature of the gas in Kelvin

According to this law, molecules in gaseous state do not exert any force among them (attraction or repulsion) and the volume of these molecules is small, therefore negligible in comparison with the volume of the container that contains them.  

Now, real gases can behave approximately to an ideal gas, under the conditions described above and taking into account the following:  

When temperature is high a real gas approximates to ideal gas, because the molecules move quickly, preventing the repulsion or attraction forces to take effect.  In addition, at low pressures, the volume of molecules is negligible.