How many grams of aluminum carbonate are produced from reacting 2.89 moles of potassium carbonate?

How many moles of potassium nitrate are produced from reacting 13.89 grams of potassium carbonate?

I had to work with this balanced equation 3K2CO3 + 2Al(NO3)3 ---> Al2(CO3)3 + 6K(NO3)

Please show step by step using dimensional analysis!

## Answers (1)

(2.89 moles K2CO3)(138.205 grams K2CO3)=399 grams K2CO3

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1 mole

The key to doing dimensional analysis is simple. You always begin with what you are given ( in this case, 2.89 moles of potassium carbonate). Then you place the unit of the given ( for this problem, moles) in the denominator (mole). Next, you must know the conversion factor between moles and grams. We know from Avogadro's number that 1 mole of potassium carbonate (K2CO3) is equal to its molar mass ( 138.205 grams), so we put this on top of the 1 mole in the denominator. This allows the unit of "moles" to get canceled out we are left with the desired unit of " grams".

Reference:AP Chemistry