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Question

Given the unbalanced equation Al+O2=Al2O3 when this equation is completely balanced using the smallest whole numbers, what is the sum of the coeffecients?


  1. 9

  2. 7

  3. 5

  4. 4


Solution

The correct option is A

9


4Al+3O2=2Al2O3.Coeffecients are the numbers in front of the element symbols .Add 4+3+2 to get 9

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