Chlorine dioxide, ClO2, has been used as a disinfectant in airconditioning systems. It reacts with water according to the equation
6ClO2 +3H2O → 5HClO3 + HCl
If 142.0 g of ClO2 is mixed with 38.0 g of H2O, how many grams of which reactant remain when the reaction is complete?