How do I find the average air temperature in an enclosed air system with outer room temperature?

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.

What is the value of the standard enthalpy of formation of an element in its most stable form?

How does the digestive system interact with the circulatory system? a. messages sent as electrical impulses from the digestive system are transported throughout the body by the circulatory system. b. nutrients taken in and broken down by the digestive system are carried to various parts of the body by the circulatory system. c. nutrients and gases are absorbed by organs in the circulatory system. then, they are transported to all parts of the body by organs in the digestive system. d. oxygen and carbon dioxide are exchanged by organs in the digestive system, and the gases are carried to the rest of the body by the circulatory system.