A.C(s)+H2O(g)===CO(g)+H2(g) ΔH>0 B.Ba(OH)2·8H2O+2NH4Cl(s)===BaCl2(aq)+ 2NH3·H2O(l)+8H2O(l) ΔH>0 C.CaC2(s)+2H2O(l)===Ca(OH)2(s)+C2H2(g) ΔH<0 D.CH4(g)+2O2(g)===CO2(g)+2H2O(l) ΔH<0
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