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Problem: Na2SO3 reacts with HCIO4 according to the reaction Na2SO3(aq) + 2HCIO4(aq) → 2NaClO4(aq) + H2O(l) + SO2(g) You wish to provide a 50% excess of 4.61 wt% aqueous HCIO4 to react with 50.0 mL of 0.0732 M Na2SO3. Calculate the mass of the 4.61 wt% aqueous HCIO4 solution required to provide the 50% excess.

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Na2SO3 reacts with HCIO4 according to the reaction 

Na2SO3(aq) + 2HCIO4(aq) → 2NaClO4(aq) + H2O(l) + SO2(g) 

You wish to provide a 50% excess of 4.61 wt% aqueous HCIO4 to react with 50.0 mL of 0.0732 M Na2SO3. Calculate the mass of the 4.61 wt% aqueous HCIO4 solution required to provide the 50% excess.