Consider the following reaction sequence for the determination of dissolved oxygen in water:
2MnSO4(aq) + 4NaOH(aq) + O 2(aq) → 2MnO2(s) + 2Na2SO4(aq) + 2H2O(l)
MnO2(s) + 2H2SO4(aq) + 2NaI(aq) → MnSO 4(aq) + I 2(aq) + Na 2SO4(aq) + 2H 2O(l)
I2(aq) + 2Na 2S2O3(aq) → Na 2S4O6(aq) + 2NaI(aq)
If 9.00 mL of 0.0240 M Na 2S2O3(aq) are used in the analysis, how many moles of dissolved oxygen were determined?
a) 4.32 x 10-4 mol
b) 2.70 x 10-5 mol
c) 5.40 x 10-5 mol
d) 2.16 x 10-4 mol
e) 1.08 x 10-4 mol
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