Chlorine dioxide, ClO2, has been used as a disinfectant in airconditioning syste

Question

Chlorine dioxide, ClO2, has been used as a disinfectant in airconditioning systems. It reacts with water according to theequation

6ClO2 +3H2O 5HClO3 + HCl

If 142.0 g of ClO2 is mixed with 38.0 g of H2O, how many grams ofwhich reactant remain when the reaction is complete?

Explanation / Answer

n(ClO2) = m/M = 142/67.45 = 2.105mol n(H2O) = m/M = 38/18.016 = 2.109mol Stoichiometry ratio = n(ClO2)/n(H2O) = 6/3 =2 Actual ratio = 2.105/2.109 = 0.998 SR > AR So, ClO2 is the limiting reagent Since ClO2 is the limiting reagent, it will completelyreacted. Mass of remaining ClO2 = 0g n(H2O) consumed = 3/6 x 2.105 = 1.0562mol n(H2O) remaining = 2.109 - 1.0562 = 1.057mol m(H2O) remaining = nM = 1.057 x 18.016 = 19.04g Hope this helps!

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