swee4tsyD8ryuvin swee4tsyD8ryuvin
  • 28-12-2015
  • Chemistry
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Which ionic equation is balanced?
(1) Fe3++ Al → Fe2++ Al3+
(2) Fe3++ 3Al → Fe2++ 3Al3+
(3) 3Fe3++ Al → 3Fe2++ Al3+
(4) 3Fe3++ Al → Fe2++ 3Al3+

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Billymkhoi
Billymkhoi Billymkhoi
  • 28-12-2015
For an equation to be balanced, the number of atoms of the reactants and products have to be equal. Therefore, (3) 3Fe3++ Al → 3Fe2++ Al3+ is the balanced equation, as you have 3 Fe atoms and 1 Al atom on both sides. The exponents are just the charges of the elements, and you don't need to care about these numbers in order to balance a chemical equation.
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