When the following equation is balanced using the smallest possible integers, what is the exponent of H 2 in the reaction quotient expression?

When the following equation is balanced using the smallest possible integers, what is the exponent of H2 in the reaction quotient expression?

Al(s) + NaOH(aq) + H2O(l) <=> Na(Al(OH)4)(aq) + H2(g) 

answer is 3.

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