Question

What is ideal gas?

Answer 1

Ideal gas molecules do not attract or repel each other.
Ideal gas molecules themselves take up no volume.

Explanation:

In detail, they have negligible intermolecular forces of attraction between molecules.
They also have negligible size or volume of molecules relative to volume of container.

So, what makes a gas non ideal?
In order of priority

1. Polar Molecules
2. Heavy Molecules

Lets take `NH_3` molecules for example. Ammonia is a gas but it has strong hydrogen bonds between molecules which causes it to deviate from ideality significantly.

Lets take `CO_2` molecules for example. CO2 has a relatively larger molecular mass of `44`. This violates the second rule of ideal gases causing it to deviate from ideality too.

Answer 2

Ideal gas: a hypothetical gas whose molecules occupy negligible space and have no interactions, and which consequently obeys the gas laws exactly.

An ideal gas obey ideal gas equation at all temperatures and pressures.

The ideal gas equation is given by

`"PV = nRT"`

where

• `"P ="` Pressure
• `"V ="` Volume
• `"n ="` Number of moles
• `"R ="` Gas constant
• `"T ="` Temperature

Ideal gas equation is the combination of following gas laws

1. Boyle’s Law
2. Charle’s Law
3. Avagadro’s Law