80. Solving a chemistry problem
91. Using Part 3, Table. 4.5, 17-19, make up the molecular and ionic reaction equations with which you can carry out the following transformations (each of the reactions you invented must proceed to the end):
91. FeS2 → SO2 → H2SO3 → CaSO3 → Ca(HSO3)2 → CaSO3.
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