【题文】下列燃烧反应的反应热不是燃烧热的是 ①H 2(g)+O 2(g)=H 2O(l) ΔH 1 ②C(s)+O 2(g)=CO(g) ΔH 2 ③S(s)+O 2(g)=SO 2(g) ΔH 3 ④2H 2S(g)+3O 2(g)=2SO 2(s)+2H 2O(l) ΔH 4
A.①③
B.②④
C.②③
D.①④
试卷相关题目
- 1【题文】已知:
A.-393.5kJ/mol
B.-679.3 kJ/mol
C.-787 k J/mol
D.+180.9 kJ/mol
开始考试点击查看答案 - 2【题文】已知:H—H、Cl—Cl、H—Cl的键能分别为436 kJ/mol、243 kJ/mol和431 kJ/mol,估计1molCl 2和1molH 2完全反应生成2 molHCl的反应热为 ( )
A.-183 kJ/mol
B.-91.5 kJ/mol
C.+183 kJ/mol
D.+91.5 kJ/mol
开始考试点击查看答案 - 3【题文】2molCl 2(g)与足量的H 2(g)反应生成HCl(g),在298K时测得放出369.2kJ热量。则下列热化学方程式不正确的是
A.H2(g)+ Cl2(g)= 2HCl(g)△H =" -" 369.2kJ·mol-1
B.2H2(g)+2Cl2(g)= 4HCl(g)△H =" -" 369.2kJ·mol-1
C.HCl(g)= 1/2H2(g)+ 1/2Cl2(g)△H =" +" 92.3kJ·mol-1
D.1/2H2(g)+ 1/2Cl2(g)= HCl(g)△H =" -" 92.3kJ·mol-1
开始考试点击查看答案 - 4【题文】已知反应:H 2(g) + O 2(g) = H 2O(g) △H 1 N 2(g) + O 2(g) = NO 2 (g) △H 2 N 2(g) + H 2(g) = NH 3 (g) △H 3 则反应2NH 3 (g) + O 2(g) =2NO 2 (g) +3H 2O(g) 的△H=
A.2△H1+2△H2—2△H3
B.△H1+△H2—△H3
C.3△H1+2△H2+2△H3
D.3△H1+2△H2—2△H3
开始考试点击查看答案 - 5【题文】已知:(1)C(s)+O 2(g)=CO 2(g) △H 1 (2)CO 2(g)+C(s)=2CO(g) △H 2 (3)2CO(g)+O 2(g)=2CO 2(g) △H 3 (4)4Fe(s)+3O 2(g)=2Fe 2O 3(s) △H 4 (5)3CO(g)+Fe 2O 3(s)=3CO 2(g)+2Fe(s) △H 5 下列关于上述反应焓变的判断正确的是
A.△H1=△H2+△H3
B.△H2>0,△H4>0
C.△H1>0,△H3<0
D.△H3=△H4+△H5
开始考试点击查看答案 - 6【题文】100g碳粉燃烧所得气体中,CO占2/3、CO 2占1/3体积,且C(s)+1/2O 2(g)=CO(g)△H=—110.35kJ/mol,CO(g)+1/2O 2(g) =CO 2(g) △H=—282.57kJ/mol, 与这些碳完全燃烧相比损失的热量是
A.784.92kJ
B.2489.44 kJ
C.1569.83kJ
D.3274.3 kJ
开始考试点击查看答案 - 7【题文】已知下列反应的热化学方程式为 (1)CH 3COOH(l)+2O 2(g)=2CO 2(g)+2H 2O(l) ΔH 1=-870.3 kJ/mol (2)C(s)+O 2(g)=CO 2(g) ΔH 2=-393.5 kJ/mol (3)H 2(g)+ O 2(g)=H 2O(l) ΔH 3=-285.8 kJ/mol 则反应2C(s)+2H 2(g)+O 2(g)=CH 3COOH(l)的ΔH为( )
A.-488.3 kJ/mol
B.-191 kJ/mol
C.-476.8 kJ/mol
D.-1 549.6 kJ/mol
开始考试点击查看答案 - 8【题文】心脏起搏器电源—锂碘电池的电池反应为:2 Li(s) + I 2 (s) =" 2" LiI(s) ΔH 已知:4 Li(s) + O 2 (g) =" 2" Li 2O(s) ΔH 1 4 LiI(s) + O 2 (g) =" 2" I 2 (s) + 2 Li 2O(s) ΔH 2 则下列说法正确的是( )
A.ΔH=1/2ΔH1 -ΔH2
B.ΔH=1/2ΔH1 +ΔH2
C.ΔH=1/2ΔH1 -1/2ΔH2
D.ΔH=1/2ΔH1 +1/2ΔH2
开始考试点击查看答案 - 9【题文】已知在298K时的有关数据:C(s)+1/2O 2(g)===CO(g);ΔH 1=-110.5kJ·mol -1; C(s)+O 2(g)===CO 2(g);ΔH 2=-393.5kJ·mol -1。则C(s)+CO 2(g)===2CO(g)的ΔH为( )
A.+283.5kJ·mol-1
B.+172.5kJ·mol-1
C.-172.5kJ·mol-1
D.-504kJ·mol-1
开始考试点击查看答案 - 10【题文】已知热化学方程式: H 2O(g)=H 2(g) + 1/2O 2(g) △ H = +241.8kJ/mol H 2(g)+ 1/2O 2(g) = H 2O(1) △ H = -285.8kJ/mol 当1g液态水变为水蒸气时,其热量变化是 ( )
A.吸热88kJ
B.吸热2.44KJ
C.放热44kJ
D.吸热44KJ
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