Mass of Magnesium bromide : 5.76 g
Complete question
What mass of Magnesium bromide is formed when 1.00 g of magnesium reacts with 5.00 g of bromine?
Reaction
[tex]\tt Mg+Br_2\rightarrow MgBr_2[/tex]
mol Mg
[tex]\tt \dfrac{1}{24}=0.042[/tex]
mol Br₂
[tex]\tt \dfrac{5}{160}=0.0313[/tex]
Limiting reactants : Br₂(smaller)
mol MgBr₂ = mol Br₂=0.0313
mass MgBr₂ :
[tex]\tt 0.0313\times 184,113 =5.76~g[/tex]