来自李少谦的问题
已知下列两个反应:a.C2H2(g)+H2(g)=C2H4(g)△H<0b.2CH4(g)=C2H4(g)+2H2(g)△H>0判断以下3个热化学方程式△H1、△H2、△H3由大到小的顺序是______.①C(s)+2H2(g)=CH4(g)△H1
已知下列两个反应:a.C2H2(g)+H2(g)=C2H4(g)△H<0
b.2CH4(g)=C2H4(g)+2H2(g)△H>0
判断以下3个热化学方程式△H1、△H2、△H3由大到小的顺序是______.
①C(s)+2H2(g)=CH4(g)△H1
②C(s)+12H2(g)=12C2H2(g)△H2
③C(s)+H2(g)=12C2H4(g)△H3.
1回答
2020-10-26 04:37