Just need justification for Ochem?

Using the reaction below, calculate the number ofmilliliters of bromine required to react completely with 5g of1,2-dimethoxbenzene.
1,2-dimethoxybenzene + Br2 --> + HBr
MW= 138.18g/mol MW=159.8g/mol
d=3.10g/mL
Update: Br2 MW= 159.8 and density= 3.10 g/mol
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