What is the average speed of a molecule f¬2 at 300 c?

What is the average speed of a molecule F­2 at 300 C?

 

An unknown mass gas has the formula ClxOy and has a density of 2.875 g/L at 756 mmHg and 11 C. What is the most likely molecular formula of the gas?

 

Answers are in the attached file with detailed explanations