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A. NH4HCO3 (s)NH3(g)+H2O(1)+CO2(g) △H>0 B.2NO2 (g)N2O4 (g) △H<0 C. Cl2 (g) + H2O(1)HCl(aq) +HClO(aq) △H>0 D. 2SO2 (g) + O2(g)2SO3 (g) △H<0
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