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Be sure to answer all parts. Without doing a calculation, predict the sign for delta S^0 for (a) CaCO3(s) + 2HCl(aq) -> CaCl2(aq) + H2O(l) + CO2(g) (b) 2 NO(g) + O2(g) -> 2NO2(g) (c) 2KClO3(s) -> 2KCl(s) + 3O2(g) (a) positive negative (b) positive negative (c) positive negative