If two moles of
chlorine gas reacts
with potassium iodide,
how many grams of
potassium chloride are
produced?

                      298.2 g of KCl

Explanation:

                    The balance chemical equation for given single replacement reaction is as follow;

                                      2 KI + Cl₂ → 2 KCl + I₂

Step 1: Calculate moles of KI produced:

According to balance equation,

                     1 mole of Cl₂ produced  =  2 moles of KCl

So,

                 2 moles of HCl will produce  =  X moles of KCl

Solving for X,

                     X  =  2 mol × 2 mol / 1 mol

                     X  =  4 moles of KCl

Step 2: Calculate Mass of KCl as;

                      Mass  =  Moles × M.Mass

                      Mass  =  4 mol × 74.55 g/mol

                      Mass  =  298.2 g of KCl