Answer
B
Work Step by Step
Aluminum reacts with Bromine that produces Aluminum Bromide.
To balance this chemical reaction, you need first to write it down.
Al+Br2->Al2Br6
Now you are trying to see how can you balance the reactance on both sides. You are trying to make the same number of each element on both sides.
First, you see that Al is not balanced so that you put 2 in front of the Al in the reactance side as 2Al + Br2-> Al2Br6 our Al is balanced. Still, Br is not So then you look as see that we need something that can multiply on two and give us 6, so that is 3. 2Al + 3Br2-> Al2Br6 because are chemical reactance are the balance we leaving it to stay as the final solution.
