发生原电池的反应通常是放热反应,在理论上可设计成原电池的是: ( )
| A．C(s)+H2O(g)="CO(g)+" H2(g)；△H>0 |
| B．Ba(OH)2.8H2O(s)+2NH4Cl(s)=BaCl2(aq)+2NH3.H2O (1) +8H2O(1)；△H>0 |
| C．CaC2(s)+2H2O(1)→Ca(OH)2(s)+C2H2(g)；△H<0 |
| D．CH4(g)+2O2(g)→CO2(g) +2H2O(1)；△H<0 |
发生原电池的反应通常是放热反应,在理论上可设计成原电池的是: ( )
| A．C(s)+H2O(g)="CO(g)+" H2(g)；△H>0 |
| B．Ba(OH)2.8H2O(s)+2NH4Cl(s)=BaCl2(aq)+2NH3.H2O (1) +8H2O(1)；△H>0 |
| C．CaC2(s)+2H2O(1)→Ca(OH)2(s)+C2H2(g)；△H<0 |
| D．CH4(g)+2O2(g)→CO2(g) +2H2O(1)；△H<0 |
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