For the reaction 2Fe + 3Cl2 → 2FeCl3 which of the following options gives the correct reactant:reactant ratio? Fe:Cl2 = 1:1 Fe:Cl2 = 2:3 Fe:Cl2 = 3:2 Fe:FeCl3 = 1:1

All depends on how much of product we use but imagine we use 1mol of KI

there's a 2:1 ratio of KI to I₂ so 1/2 = 0.5mol of I₂

the same applied to the Cl₂ there is a 2:1 ratio, therefore, 0.5mol of Cl₂ is required

to find mass (g) multiple moles by RFM = 0.5 x 71 = 35.5g

Hope that helps :)