5 What does 2Na2O mean?

Tell me the iupac name of the following compounds:

Amixture with the same composition throughout is!

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?