HELLLPP....Bromobenzene reaction with Magnesium to create its grignard reagent?

I cant figure out how to balance the equation....im trying to see which one is excess and which one is limited...(I cant connect the things ive learned in gen chem to this problem)....is it already in a 1 to 1 molar ratio...PLZZZ HELP FASTTT THANKSss
Update: oh ok nvm i got it.. sorry i didnt give the mass of each product, but i guess all i needed to know was that 1 mole of each reactant produces one mole of product (their all 1 to 1)...and yah in my experiment the Bromobenzene is in excess...thanks for answering so fast!
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