Answer the questions about the following reaction. 2K(s) + Br2(l) 2KBr(s)

How many molecules of Br are used in the reaction?
1,2,or3
How many bromine atoms are used in the reaction?
1,2,3,or4
How many moles of KBr are formed?
1,2,3,or4
What is the mole ratio of Br2 to KBr?
1/2,1/1,or 3/2

What do electromagnetic waves carry? how are they produced through which media can they move? where do they transfer energy? what do they not transfer? what do mechanical waves carry? how are they produced? through which media can they move? where do they transfer energy? what do they not transfer?