在同温同压下,下列各组热化学方程式中b>a的是( )A.H2(g)+Cl2(g)=2HCl(g);△H=-a 1/2H2(g)+1/2Cl2(g)=HCl(g);△H=-b B.C(s)+1/2O2(g)=CO (g);△H=-a C(s)+O2(g)=CO2 (g);△H=-b C.2H2(g)+O2(g)=2H2O(l);△H=-a 2H2(g)+O2(g)=2H2O(g);△H=-b
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![在同温同压下,下列各组热化学方程式中b>a的是( )A.H2(g)+Cl2(g)=2HCl(g);△H=-a 1/2H2(g)+1/2Cl2(g)=HCl(g);△H=-b B.C(s)+1/2O2(g)=CO (g);△H=-a C(s)+O2(g)=CO2 (g);△H=-b C.2H2(g)+O2(g)=2H2O(l);△H=-a 2H2(g)+O2(g)=2H2O(g);△H=-b](/uploads/image/z/3149996-68-6.jpg?t=%E5%9C%A8%E5%90%8C%E6%B8%A9%E5%90%8C%E5%8E%8B%E4%B8%8B%2C%E4%B8%8B%E5%88%97%E5%90%84%E7%BB%84%E7%83%AD%E5%8C%96%E5%AD%A6%E6%96%B9%E7%A8%8B%E5%BC%8F%E4%B8%ADb%3Ea%E7%9A%84%E6%98%AF%EF%BC%88+%EF%BC%89A.H2%28g%29%2BCl2%28g%29%3D2HCl%28g%29%3B%E2%96%B3H%3D-a+1%2F2H2%28g%29%2B1%2F2Cl2%28g%29%3DHCl%28g%29%3B%E2%96%B3H%3D-b+B.C%28s%29%2B1%2F2O2%28g%29%3DCO+%28g%29%3B%E2%96%B3H%3D-a+C%28s%29%2BO2%28g%29%3DCO2+%28g%29%3B%E2%96%B3H%3D-b+C.2H2%28g%29%2BO2%28g%29%3D2H2O%28l%29%3B%E2%96%B3H%3D-a+2H2%28g%29%2BO2%28g%29%3D2H2O%28g%29%3B%E2%96%B3H%3D-b)
在同温同压下,下列各组热化学方程式中b>a的是( )A.H2(g)+Cl2(g)=2HCl(g);△H=-a 1/2H2(g)+1/2Cl2(g)=HCl(g);△H=-b B.C(s)+1/2O2(g)=CO (g);△H=-a C(s)+O2(g)=CO2 (g);△H=-b C.2H2(g)+O2(g)=2H2O(l);△H=-a 2H2(g)+O2(g)=2H2O(g);△H=-b
在同温同压下,下列各组热化学方程式中b>a的是( )
A.H2(g)+Cl2(g)=2HCl(g);△H=-a
1/2H2(g)+1/2Cl2(g)=HCl(g);△H=-b
B.C(s)+1/2O2(g)=CO (g);△H=-a
C(s)+O2(g)=CO2 (g);△H=-b
C.2H2(g)+O2(g)=2H2O(l);△H=-a
2H2(g)+O2(g)=2H2O(g);△H=-b
D.S(g)+O2(g)=SO2 (g);△H=-a
S(s)+O2(g)=SO2 (g);△H=-b
在同温同压下,下列各组热化学方程式中b>a的是( )A.H2(g)+Cl2(g)=2HCl(g);△H=-a 1/2H2(g)+1/2Cl2(g)=HCl(g);△H=-b B.C(s)+1/2O2(g)=CO (g);△H=-a C(s)+O2(g)=CO2 (g);△H=-b C.2H2(g)+O2(g)=2H2O(l);△H=-a 2H2(g)+O2(g)=2H2O(g);△H=-b
答案是b.
A:a=2b 放出热量的多少与反应物的物质的量有关。反应物的物质的量越多,则放热越多
B:aC:a>b 液体气化要吸热
D:a>b 固体升华要吸热
选B
这个题的选项是B。