Answer:
25.6 moles of K.
Step-by-step explanation:
In the chemical equation you can see that 2 moles of potassium (K) react with 1 mol of magnesium bromide (MgBr2), so based on this information let's find the number of moles of K that we required by 12.8 moles of MgBr2:
The answer would be that we require 25.6 moles of K.