已知:①2Zn(s)+O2(g)=2ZnO(s);△H=-701.0kJ·mol-1 ②2Hg(l)+O2(g)=2HgO(s);△H=-181.6kJ·mol-1 则反应Zn(s)+ HgO(s)=ZnO(s)+ Hg(l)的△H为
A.+519.4kJ·mol-1 | B.+259.7 kJ·mol-1 |
C.-519.4kJ·mol-1 | D.-259.7kJ·mol-1 |
已知:①2Zn(s)+O2(g)=2ZnO(s);△H=-701.0kJ·mol-1 ②2Hg(l)+O2(g)=2HgO(s);△H=-181.6kJ·mol-1 则反应Zn(s)+ HgO(s)=ZnO(s)+ Hg(l)的△H为
A.+519.4kJ·mol-1 | B.+259.7 kJ·mol-1 |
C.-519.4kJ·mol-1 | D.-259.7kJ·mol-1 |