How should all measurements be recorded

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

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?