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Stoichiometry question?

Hello i am in AP chem this year and i forgot a lot over the summer. I worked this problem out but i want to make sure i did it correctly. The question is: How many moles of potassium hydroxide are needed to completely react with 3.47 moles of aluminum sulfate according to the balanced equation?

Equation: 6 KOH + 2 Al(OH)3 + 3 K2SO4

I got 20.82 moles of KOH

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