This equation is not balanced. Click on the coefficient we should change first.
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 The coefficient we should change first is for .

Explanation:

The given reaction equation is as follows.

Here, number of atoms present on reactant side are as follows.

Number of atoms present on the product side are as follows.

To balance this equation, multiply Al by 2 and by 3 on reactant side. Also, multiply by 2 and Ni by 3 on the product side.

Hence, the equation can be rewritten as follows.

Now, number of atoms present on reactant side are as follows.

Number of atoms present on product side are as follows.

Since, the atoms on both reactant and product side are same. Hence, it is now a balanced chemical equation.

Thus, we can conclude that the coefficient we should change first is for .

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