One molecule of dietary fat is made by joining three molecules of to one molecule of . What is the formal name of the resulting molecule

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

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?

Draw the lewis structure for the trisulfur s3 molecule. be sure to include all resonance structures that satisfy the octet rule.