the molar m of Magnesium Iodide is 278, the molar m of Bromine is 160. grams divided by molar m=moles. So you have 2.0 moles of Magnesium iodide, and 2.3 moles of bromine, so bromine is in excess. .3 moles remain, .3*160=48grams of bromine remaining.
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