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Answer:
1 mole of NH3 has 6.023×10^23 molecules.
Mass of Magnesium bromide : 5.76 g
<h3>Further explanation</h3>
Complete question
<em>What mass of Magnesium bromide is formed when 1.00 g of magnesium reacts with 5.00 g of bromine?</em>
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Reaction
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mol Mg

mol Br₂

Limiting reactants : Br₂(smaller)
mol MgBr₂ = mol Br₂=0.0313
mass MgBr₂ :

False because electrons are what help make up molecules, therefore they have to be smaller.