Regarding the topic moles , when do we know whether they want us to multiply with the number of atoms and the avogadro's number or just divide/multiply by the avogadro's number only.

Amixture of gaseous sulfur dioxide and oxygen are added to a reaction vessel and heated to 1000 k where they react to form so3(g). if the vessel contains 0.669 atm so2(g), 0.395 atm o2(g), and 0.0851 atm so3(g) after the system has reached equilibrium, what is the equilibrium constant kp for the reaction: 2 so2(g) o2(g) ⇌ 2 so3(g)

Perform the following mathematical operations and report the answer to the appropriate number of significant figures 5.87998 + 3.100

List four observations that indicate that a chemical reaction may be taking place