If there are 45mmol of iodide ions, 80mmol of hydrogen ions, and 25mmol of present in the solution, what is the limiting reagent?
A.
B.
C.
D.
B
Since a balanced equation gives the proper mole ratio, a balanced equation also gives the millimole ratio. Water is not a reactant, so choice A can be immediately eliminated. 45mmol of would be enough to run the reaction 4.5 times. Likewise, 80mmol of would be enough to run the reaction 5 times. 25mmol of would be enough to run the reaction 12.5 times. Therefore, the iodide ion is the limiting reagent.
