Question

How many grams of Br2 are needed to react completely with 19.6 grams of Al?Al + Br2 AlBr3Be sure to balance the equation.
Answers:

38.7 grams

43.6 grams

87.1 grams

174 grams

Answer 1

put together the balanced equation, first

Answer 2

You will do a conversion into the mol/mol ratio. I don't know if you need to show your work, but here it is:

19.6g Al (1mol Al/26.982g Al)(3mol Br2/2mol Al) (159.818g Br2/1mol Br2) =

174.14g Br2
So it looks as though D is your answer

Answer 3

Also the balanced equation looks like this (providing your numbers in the original equation are correct)

2Al + 3Br2 --> 2AlBr3