STOICHIOMETRY MoleMole Calculations 28 In the reaction of ir

STOICHIOMETRY Mole-Mole Calculations 28) In the reaction of iron and sulfur, how many moles of sulfur are needed to react with 9.0 moles of iron? 2Fe (s) + 3S ( Fe,S, (s)

Solution

28):

Mole ratio of Fe and S is 2:3.

Moles of S needed to react with 9.0 moles of iron = 9.0 mol Fe x (3 mol S/2mol Fe) = 13.5 mol S

So, 13.5 moles of sulfur is needed to react with 9.0 moles of iron.