已知(l)H2(g)+1/2O2(g)=H2O(g);已知(l)H2(g)+1/2O2(g)=H2O(g); △H1=a kJ/mol(2)2H2(g)+O2(g)=2H2O(g); △H2=b kJ/mol(3)H2(g)+1/2O2(g)=H2O(l); △H3=c kJ/mol(4)2

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已知(l)H2(g)+1/2O2(g)=H2O(g);已知(l)H2(g)+1/2O2(g)=H2O(g); △H1=a kJ/mol(2)2H2(g)+O2(g)=2H2O(g); △H2=b kJ/mol(3)H2(g)+1/2O2(g)=H2O(l); △H3=c kJ/mol(4)2
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已知(l)H2(g)+1/2O2(g)=H2O(g);已知(l)H2(g)+1/2O2(g)=H2O(g); △H1=a kJ/mol(2)2H2(g)+O2(g)=2H2O(g); △H2=b kJ/mol(3)H2(g)+1/2O2(g)=H2O(l); △H3=c kJ/mol(4)2
已知(l)H2(g)+1/2O2(g)=H2O(g);
已知(l)H2(g)+1/2O2(g)=H2O(g); △H1=a kJ/mol
(2)2H2(g)+O2(g)=2H2O(g); △H2=b kJ/mol
(3)H2(g)+1/2O2(g)=H2O(l); △H3=c kJ/mol
(4)2H2(g)+O2(g) =2H2O(l); △H4=d kJ/mol
下列关系式中正确的是 ( )
A. a<c <0 B.b>d>0 C.2a=b<0 D.2c=d>0

已知(l)H2(g)+1/2O2(g)=H2O(g);已知(l)H2(g)+1/2O2(g)=H2O(g); △H1=a kJ/mol(2)2H2(g)+O2(g)=2H2O(g); △H2=b kJ/mol(3)H2(g)+1/2O2(g)=H2O(l); △H3=c kJ/mol(4)2
该反应类型为放热反应,△H<0 故BD错.
H2O(g)到H2O(l)为放热过程,故A正确.
热化学方程式中,△H值与方程式中系数对应成比例,故C正确.

AC

AC

c

已知(l)H2(g)+1/2O2(g)=H2O(g);已知(l)H2(g)+1/2O2(g)=H2O(g); △H1=a kJ/mol(2)2H2(g)+O2(g)=2H2O(g); △H2=b kJ/mol(3)H2(g)+1/2O2(g)=H2O(l); △H3=c kJ/mol(4)2 H2(g)+2/1O2(g)=H2O(l) 2H2(g)+O2(g)=2H2O(l) 这两个反应焓变为什么是第一个大? 12日化学:8,已知:(1)H2(g)+ 1/2 O2(g)=H2O(g) △H1=akJ.mol-1(2) 2H2(g)+ O2(g)=2H2O(g) △H2=bkJ.mol-1(3) H2(g)+ 1/2 O2(g)=H2O(l) △H3=ckJ.mol-1(4) 2H2(g)+ O2(g)=2H2O(l) △H4=dkJ.mol-1下列关系式中正确的是:A a<c< 1、根据热化学反应方程式(标况下):S(S)+O2(g)=SO2(g) △H= -297.23 KJ/mol则放出的热量_____(大于/小于/等于)297.23 KJ2、已知2H2(g)+O2(g)=2H20(l) △H= -569.6 KJ/MOL2H2O(g)=2H2(g)+O2(g) △H= +482.1 KJ/MOL现有1G液态H2 一道化学焓变题10、已知:H2(g)+ O2(g)= H2O(l) △H = -285.8kJ• mol-1 CH4(g)+ 2O2(g)=CO2(g)+2H2O(l) △H= -890kJ• mol-1现有H2与CH4的混合气体112L(标准状况),使其完全燃烧生成CO2和H2O(l),若实验 反应热的,这类题怎么做?谢谢!已知:2H2(g)+ O2(g)=2H2O(l) ΔH= -571.6KJ• mol-1 CH4(g)+ 2O2(g)=CO2(g)+2H2O(l) ΔH= -890KJ• mol-1现有H2与CH4的混合气体112L(标准状况),使 已知:CH4(g)+2O2(g)=CO2(g)+2H2O(l) △H=-Q1kJ•mol-1 2H2(g)+O2(g)=2H2O(g) △H=-Q2kJ•mol-1 2H2(g)+O2(g)=2H2O(l) △H=-Q3kJ•mol-1 常温下,取体积比为4:1的 在同温同压下,下列各组热化学方程式中,△H1>△H2的是( )A 2H2(g)+O2(g)==2H2O(g);△H1 2H2(g)+O2(g)==2H2O(l); △H2B S(g)+O2(g)==SO2(g); △H1 S(s)+O2(g)==SO2(g); △H2C C(s)+1/2O2(g)==CO(g); △H1 C(s)+ O2(g)==CO2 (g) 某种城市煤气的组成:50%氢气、30%甲烷、10%一氧化碳、6%氮气和4%的二氧化碳.已知:H2(g)+1/2O2(g)→H2O(l)+285.8KJCO(g)+1/2O2(g)→CO2(g)+282.6kJCH4(g)+2O2(g)→CO2(g)+2H2O(l)+890.3KJ计算在标准状况 盖斯定律的题目NH3(g)燃烧生成N2(g)和H2O(l)已知1.H2(g)+ 1/2 O2(g)=H2O(g)2.1/2 N2(g)+3/2 H2(g)=NH3(g)则NH3(g)的燃烧热△H=?补充 1.△H1=-285.8KJ/moL H2(g)+ 1/2 O2(g)=H2O(l)2. 能正确表示可燃物燃烧热的热化学方程式(详细过程)A.H2(g)+CL2(g)+2HCL(g) H=-18406KJ/molB.CH4(g)+2O2(g)=CO2(g)+2H2O(g) H=-802.3KJ/molC.2CO(g)+O2(g)=2CO2(g) H=-566KJ/molD.H2(g)+1/2O2(g)=H2O(l) H=-28508KJ/molD.H2(g)+1/2O2(g)=H2O(l) H 1.下列热化学方程式中,化学方程的△H前者大于后者的是 :(1)C(s)+O2(g)=CO2(g);△H1C(s)+1/2O2(g)=CO2(g);△H2(2)S(s)+O2(g)=SO2(g);△H3S(g)+O2(g)=SO2(g);△H4(3)H2(g)+1/2O2(g)=H2O(l);△H52H2(g)+O2(g)=2H2O(l);△H6(4)CaCO3(S)= 已知:CH4(g)+2O2(g)→CO2(g)+2H2O(g) ΔH=- Q1 ; 2H2(g)+O2(g) == 2H2O(g) ΔH=- Q2; H2O(g) == H2O(l) ΔH=- Q3 常温下,取体积比为4:1的甲烷和H2的混合气体112L(标准状况下),经完全燃烧后恢复到常温,则放出 热反应方程式的含义 H2(g)+1/2 O2(g)=H2O(l)+285.8kj 已知下列两个热化学方程式:H2(g)+1/2O2(g)=H2O(l) △H=-285.8kj/m已知下列两个热化学方程式:H2(g)+1/2O2(g)=H2O(l) △H=-285.8kj/molC3H8(g)+5O2(g)=3CO2(g)+4H2O(L) △H=-2220.0kj/molH2的燃烧 “嫦娥一号”登月成功,实现了中国人“奔月”的梦想.(2)已知:H2(g)+1 /2 O2(g)═H2O(L) △H=-285.8KJ/mol .1H2(g)=H2(l)△H=-0.92kJ•mol-1; O2(g)=O2(l)△H=-6.84kJ•mol-1;H2O(l)=H2 已知(l)H2(g)+1/2O2(g)=H2O(g);△H1=a kJ/mol求分析思路已知(l)H 2 (g)+1/2O 2 (g)=H 2 O(g); △H 1 =a kJ/mol (2)2H 2 (g)+O 2 (g)=2H 2 O(g); △H 2 =b kJ/mol (3)H 2 (g)+1/ 已知:2H2(g)+ O2(g)=2H2O(l) ΔH= -571.6KJ• mol-1CH4(g)+ 2O2(g)=CO2(g)+2H2O(l) ΔH= -890KJ• mol-1现有H2与CH4的混合气体112L(标准状况),使其完全燃烧生成CO2和H2O(l),若实验测得反应放热3695KJ,则