chemistry help with writing equation and solving!?

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troupe 6470

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so i can't even figure how to write this equation let alone balance and solve it. i'm going into AP chemistry next year and the question is on a work packet we have over the summer. all i know is that i'm supposed to end up with 60.0 moles of NaOH. here's the question:

In the decomposition of sodium hydroxide, how many moles of sodium hydroxide are needed to form 30.0 moles of water?

we're supposed to use dimensional analysis if that makes a difference.
i just need help writing and balancing the equation, after that i should be able to figure it out so if anyone can help with that part it would be greatly appreciated!!
 
2 NaOH ---> Na20 + H20

mole ratio is 2:1
so
it takes (2 mol NaOH / mol H20)
use as a conversion factor
solving
30 mol H2O * 2 mol NaOH/mol H2O =........
.........60 mol NaOH
 
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