【题文】已知下列热化学方程式: (1)CH 3COOH(l)+2O 2(g)==2CO 2(g)+2H 2O(l) Δ H 1=-870.3 kJ·mol - 1 (2)C(s)+O 2(g)===CO 2(g) Δ H 2=-393.5 kJ·mol - 1 (3)H 2(g)+O 2(g)===H 2O(l) Δ H 3=-285.8 kJ·mol - 1, 则反应2C(s)+2H 2(g)+O 2(g)===CH 3COOH(l)的焓变Δ H为( )
A.488.3 kJ·mol-1
B.-244.15 kJ·mol-1
C.244.15 kJ·mol-1
D.-488.3 kJ·mol-1
试卷相关题目
- 1【题文】.已知下列热化学方程式: (1)CH3COOH(l)+2O2(g) ="==" 2CO2(g)+2H2O(l) △H1= -870.3 kJ·mol-1 (2)C(s)+O2(g) ="==" CO2(g) △H2= -393.5 kJ·mol-1 (3)H2(g)+O2(g) === H2O(l) △H3= -285.8 kJ·mol-1 则反应2C(s)+2H2(g)+O2(g)="==CH3COOH(l)" 的焓变△H为( )kJ·mol-1
A.488.3
B.-244.15
C.244.15
D.-488.3
开始考试点击查看答案 - 2【题文】相关数据如下表: 则已知H 2(g) + Br 2(g) =" 2HBr" (g)△H 为
A.△H =" +" 102kJ/mol
B.△H =" -" 102kJ/mol
C.△H =" +" 267kJ/mol
D.△H =" -" 267kJ/mol
开始考试点击查看答案 - 3【题文】已知:2CO(g) + O 2(g) = 2CO 2(g) Δ H="-566" kJ·mol -1 N 2(g) + O 2(g) =2NO(g) Δ H="+180" kJ·mol -1 则2CO(g) +2NO(g) = N 2(g)+2CO 2(g)的Δ H是
A.-386kJ·mol-1
B.+386kJ·mol-1
C.-
D.+746kJ·mol-1
开始考试点击查看答案 - 4【题文】已知: 2H 2 (g)+O 2 (g)=2H 2O(l) △H=" a" kJ/mol, 2H 2 (g)+O 2 (g)=2H 2O(g) △H=" b" kJ/mol, 则a、b的大小关系是( )
A.a=b
B.a>b
C.a<b
D.无法确定
开始考试点击查看答案 - 5【题文】已知: ⑴H 2(g) + 0.5O 2(g) =H 2O(g) △H 1=a kJ/mol ⑵2H 2(g) + O 2(g) = 2H 2O(g) △H 2=b kJ/mol ⑶H 2(g) + 0.5O 2(g) =H 2O(l) △H 3=c kJ/mol ⑷2H 2(g) + O 2(g) = 2H 2O(l) △H 4=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
开始考试点击查看答案 - 6【题文】已知2H 2(g)+ O 2(g)=2H 2O(g) △H= ─484KJ/moL,则反应: H 2O(g)= H 2(g)+1/2O 2(g) 的△H为
A.─484KJ/moL
B.+484KJ/moL
C.─242KJ/moL
D.+242KJ/moL
开始考试点击查看答案 - 7【题文】2g碳与水蒸气反应生成CO和H 2,需吸收21.88kJ热量,此反应的热化学方程式为
A.C + H2O ==CO + H2ΔH =+131.3kJ·mol—1
B.C(s)+ H2O(g) ==CO(g) + H2(g)ΔH =+10.94kJ·mol—1
C.C(s)+ H2O(g) ==CO(g) + H2(g)ΔH = -131.3kJ·mol—1
D.C(s)+ H2O(g) ==CO(g) + H2(g)ΔH = +131.3kJ·mol—1
开始考试点击查看答案 - 8【题文】已知:O 2(g) = O 2 +(g)+e - H 1=" +1175.7" kJ·mol -1 PtF 6 -(g) =PtF 6(g)+e - H 2=" +771.1" kJ·mol -1 O 2 +(g)+PtF 6 -(g) =O 2PtF 6(S) H 3=" -482.2" kJ·mol -1 则反应O 2(g)+PtF 6(g) = O 2PtF 6 (s)的 H是( )
A.77.6 kJ
B.-77.6 kJ·mol-1
C.+77.6kJ·mol-1
D.-886.8kJ·mol-1
开始考试点击查看答案 - 9【题文】已知:Fe 2O 3 (s)+C(s)= CO 2(g)+2Fe(s) △H=234.1kJ·mol -1 C(s)+O 2(g)=CO 2(g) △H=-393.5kJ·mol -1 , 则 2Fe(s)+O 2(g)=Fe 2O 3(s)的△H是( )
A.-824.4kJ·mol- 1
B.-627.6kJ·mol-1
C.-744.7kJ·mol-1
D.-169.4kJ·mol-1
开始考试点击查看答案 - 10【题文】下列热化学方程式书写正确的是( )
A.2SO2+O22SO3 ΔH=-196.6 kJ·mol-1
B.C(s)+O2(g)===CO2(g) ΔH=+393.5 kJ·mol-1
C.H2(g)+Cl2(g)===HCl(g) ΔH=-92.5 kJ·mol-1
D.H+(aq)+OH-(aq)===H2O(l) ΔH=+57.3 kJ
开始考试点击查看答案