If 0.25 moles of potassium chloride are consumed completely, how many moles of potassium fluoride will be produced?

Answer is: 0,25 mol of potassium-fluoride.
Chemical reaction: 2KCl + F₂ → 2KF + Cl₂.
KCl - potassium chloride.
F₂ - fluorine.
KF - potassium fluoride.
Cl₂ - chlorine.
from reaction: n(KCl) : n(KF) = 2 : 2 (1 : 1).
n(KCl) = 0,25 mol.
n(KF) = n(KCl) = 0,25 mol.
n - amount of substance.