2.
How many valence electrons do the following elements have:
Si, C, O, Ar, K

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

What is the vapor pressure of a solution with a benzene to octane?