【题文】在298 K、100 kPa时,已知: 2H 2O(g)=O 2(g)+2H 2(g) ΔH 1 Cl 2(g)+H 2(g)="2HCl(g)" ΔH 2 2Cl 2(g)+2H 2O(g)=4HCl(g)+O 2(g) ΔH 3 则ΔH 3与ΔH 1和ΔH 2间的关系正确的是
发布时间:2021-09-15
A.ΔH3=ΔH1-ΔH2
B.ΔH3=ΔH1+ΔH2
C.ΔH3=ΔH1-2ΔH2
D.ΔH3=ΔH1+2ΔH2
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- 1【题文】已知下列数据:Fe(s) + 1/2O 2(g) = FeO(s) ΔH=-272kJ/mol;2Al(s) + 3/2O 2(g) = Al 2O 3(s) ΔH=-1675kJ/mol;则2Al(s) + 3FeO(s) = Al 2O 3(s) + 3Fe(s)的ΔH是
A.-859 kJ/mol
B.+859 kJ/mol
C.-1403 kJ/mol
D.-2491 kJ/mol
开始考试点击查看答案 - 2【题文】已知下列两个热化学方程式 2H 2(g)+O 2(g)=2H 2O(1) △H= -571.6KJ/mol C 3H 8(g)+5O 2(g)=3CO 2(g)+4H 2O(1) △H=-2220.0kJ/mol 实验测得,5mol氢气和丙烷的混合气体完全燃烧时放热3847kJ,则混合气体中氢气与丙烷的体积比是
A.1:3
B.3:1
C.1:4
D.1:1
开始考试点击查看答案 - 3【题文】已知:2Zn(s)+O 2(g)==="2ZnO(s)" ΔH 1=-701.0 kJ·mol -1 2Hg(l)+O 2(g)==="2HgO(s)" ΔH 2=-181.6 kJ·mol -1 则反应Zn(s)+HgO(s)===ZnO(s)+Hg(l)的ΔH为
A.+519.4 kJ·mol-1
B.+259.7 kJ·mol-1
C.-259.7 kJ·mol-1
D.-519.4 kJ·mol-1
开始考试点击查看答案 - 4【题文】已知:(1)CH 3COOH(l)+2O 2(g)=2CO 2(g)+2H 2O(l) △H 1 (2)C(s)+O 2(g)=CO 2(g) △H 2 (3)2H 2(g)+O 2(g)=2H 2O(l) △H 3 (4)2CO 2(g)+4H 2(g)=CH 3COOH(l)+2H 2O(l) △H 4 (5)2C(s)+2H 2(g)+O 2(g)=CH 3COOH(l) △H 5 下列关于上述反应的焓变的判断正确的是
A.△H1>0,△H2<0
B.△H5=2△H2+△H3-△H1
C.△H3>0,△H5<0
D.△H4=△H1-2△H3
开始考试点击查看答案 - 5【题文】已知:①2H 2(g)+O 2(g)=2H 2O (g) △H 1 ②3H 2(g)+Fe 2O 3(s)=2Fe(s)+3H 2O (g) △H 2 ③2Fe(s)+3/2O 2(g)=Fe 2O 3(s) △H 3 ④2Al(s)+3/2O 2(g)=Al 2O 3(s) △H 4 ⑤2Al(s)+Fe 2O 3(s)=Al 2O 3(s)+2Fe(s) △H 5 下列关于上述反应焓变的判断正确的是
A.△H1<0,△H3>0
B.△H5<0,△H4<△H3
C.△H1=△H2+△H3
D.△H3=△H4+△H5
开始考试点击查看答案 - 6【题文】已知下列热化学方程式: Zn(s)+ O 2(g)==="ZnO(s)" ΔH 1=-351.1 kJ/mol Hg(l)+ O 2(g)==="HgO(s)" ΔH 2=-90.7 kJ/mol 由此可知Zn(s)+HgO(s)===ZnO(s)+Hg( l) ΔH 3,其中ΔH 3是
A.-441.8 kJ/mol
B.-254.6 kJ/mol
C.-260.4 kJ/mol
D.-438.9 kJ/mol
开始考试点击查看答案 - 7【题文】已知:①2Zn(s)+O 2(g) 2ZnO(s)△H=-701.0kJ·mol -1 ②2Hg(l)+O 2(g) 2HgO(s) △H=-181.6kJ·mol -1 则反应Zn(s)+HgO(s) ZnO(s)+Hg(l)的△H为
A.+519.4kJ·mol-1
B.+259.7kJ·mol-1
C.-259.7kJ·mol-1
D.-519.4kJ·mol-1
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