问题
选择题
已知:2Zn(s)+O2(g)=2ZnO(s) △H= -701.0kJ/mol 2Hg(l)+O2(g)=2HgO(s) △H= -181.6kJ/mol,则反应:Zn(s)+ HgO(s)=ZnO(s)+ Hg(l)的△H为[ ]
A .+519.4kJ/mol
B .+259.7 kJ/mol
C .-259.7 kJ/mol
D .-519.4kJ/mol
答案
答案:D
已知:2Zn(s)+O2(g)=2ZnO(s) △H= -701.0kJ/mol 2Hg(l)+O2(g)=2HgO(s) △H= -181.6kJ/mol,则反应:Zn(s)+ HgO(s)=ZnO(s)+ Hg(l)的△H为[ ]
A .+519.4kJ/mol
B .+259.7 kJ/mol
C .-259.7 kJ/mol
D .-519.4kJ/mol
答案:D