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AlBr3 is the product thus:
2 Al + 3 Br2 ------> 2 AlBr3
Aluminum has the anion charge of 3+ and a bromine atom has just 1+ thus you need 3 bromine atoms in order to make the product and end up with a non-charged molecule. Unfortunately bromine comes in its diatomic (two of the same atom) in this equation thus you can't have 1.5 of those molecules. If you multiply in such a way, in this case by two, to make everything whole numbers you have your equation.
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What is the balanced equation for Fe2 plus O3 plus C equals CO2 plus Fe?
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What is the coeficient needed for Al to balance Al plus O2 - Al2O3?
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Balanced equation for aluminum plus oxygen equals aluminum oxide?
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What coefficient does Al(NO3)3 have in the balanced equation?
2
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What coefficient does Al(s) have in the balanced equation?
This depends on the reaction; aluminium is trivalent Al(3+).
What is the balanced equasion to aluminium plus sulphric acid?
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