12. Sodium bicarbonate can be prepared from sodium sulfate by the following three-step process:
Na2SO4 + C -> Na2S + CO
Na2S + CaCO3 -> CaS + Na2CO3
Na2CO3 + H2O + CO2 -> NaHCO3
How many kilograms of sodium bicarbonate could be formed from one kilogram of sodium sulfate (assuming excess amounts of the other reactants)? Assume that each step has an 82% yield.
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