Explain why air is not a good conductor of heat

When a scientific theory has been tested and proved by the scientific community, it becomes a law

What would be the original temperature of a gas that has a volume of 2.0 l and a pressure of 2.0 atm and an unknown temperature that the volume increased to 3.5 l in its pressure decreased to 1.0 atm if the final temperature is measured to be 11°c

How many atomic mass units are equal to 1.672×10−24 g of protons?