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Given the following data, calculate the moles of S2O32- consumed. Molar concentration of Na2S2O3: 0.02 mol/L...

Given the following data, calculate the moles of S2O32- consumed.

Molar concentration of Na2S2O3: 0.02 mol/L

Volume of Na2S2O3: 6 mL

M equals fraction numerator m o l e s over denominator V o l u m e space left parenthesis L right parenthesis end fraction

(Provide your answer in scientific notation and with two sig figs) Example: if answer is 0.00002 then input 2.0e-5 or 2.0E-5

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Answer #1

Na2S2O3 -----------------> 2Na^+1 + S2O3^-2

This means 1 Na2S2O3 gives 2 moles of Na^+1 and 1 S2O3^-2.

SO, number of moles of S2O3^-2 is equal to the number of moles of Na2S2O3.

Moles = molarity × volume of solution in L

= 0.02 mol/L × 0.006 L = 0.00012 moles = 1.2E-4

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