How many moles of al are necessary to form 28. 6 g of albr₃ from this reaction: 2 al(s) + 3 br₂(l) → 2 albr₃(s) ?.

If (a, b) is the solution to the system of equations shown above, and a and b are integers, then what is the value of a+b?

Two technicians are discussing how to test a car's exhaust by holding a small piece of paper within an inch of the tailpipe mouth. technician a says that if the paper is vibrating due to a "puffing" output from the tailpipe, this signals a smoothly running engine. technician b says that if the paper is being drawn toward the tailpipe, this could indicate burned exhaust valves. who is correct? a. technician b b. both technicians a and b c. technician a d. neither technicians a or b

Class iii atmospheric hazards are those involving