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