How many moles of potassium nitrate are produced when two miles of potassium phosphate react with two moles of aluminum nitrate?
First write balanced chemical equation for this ion-exchange reaction :
This balanced chemical equation represents the mole ratio in which the chemicals combine and form products.
So clearly 1 mole of each reactant combines to form 3 moles potassium nitrate and 1 mole aluminium phosphate.
Hence, by ratio and proportion, 2 moles of each reactant will produce 6 moles potassium nitrate and 2 moles aluminium phosphate.