已知:O2(g) = O2+(g)+e- △H1= +1175.7 kJ·mol-1PtF6-(g) =PtF6(g)+e- △H2= +771.1 kJ·mo
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已知:O2(g) = O2+(g)+e- △H1= +1175.7 kJ·mol-1 PtF6-(g) =PtF6(g)+e- △H2= +771.1 kJ·mol-1 O2+(g)+PtF6-(g) =O2PtF6(s) △H3= -482.2 kJ·mol-1 则反应O2(g)+PtF6(g) = O2PtF6(s)的△H是 |
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A.77.6 kJ B.-77.6 kJ·mol-1 C.+77.6kJ·mol-1 D.-886.8kJ·mol-1 |
答案
B |
举一反三
甲醇质子交换膜燃料电池中将甲醇蒸气转化为氢气的两种反应原理是 ①CH3OH(g)+H2O(g)=CO2(g)+3H2(g);△H=+48.0kJ·mol-1 ②CH3OH(g)+ O2(g)=CO2(g)+2H2(g); △H=-192.9kJ·mol-1 下列说法正确的是 |
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A.CH3OH的燃烧热为192.9kJ·mol-1 B.反应①中的能量变化如上图所示 C.CH3OH转变成H2的过程一定要吸收能量 D.根据②推知反应CH3OH(1)+1/2O2(g)=CO2(g)+2H2(g)的△H > -192.9kJ·mol-1 |
已知: C(s)+1/2O2(g) === CO(g) △H1= -110.5 kJ·mol-1 C(s)+O2(g) === CO2(g) △H2= -393.5 kJ·mol-1 则C(s)+CO2(g) ===2CO(g) 的△H 为 |
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A.+283.5 kJ·mol-1 B.+172.5 kJ·mol-1 C.-172.5 kJ·mol-1 D.-504 kJ·mol-1 |
根据盖斯定律判断下图所示的物质转变过程中,正确的等式是 |
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A.△H= △H2=△H3= △H4 B.△H1+△H2=△H3+△H4 C.△H1+△H2+ △H3=△H4 D.△H1= △H2+ △H3+ △H4 |
已知下列热化学方程式: 2Zn(s) + O2(g)= ZnO(s) ΔH= -702.2kJ·mol-1 Hg(l) + 1/2 O2(g)= HgO(s) ΔH= -90.7 kJ·mol-1 由此可知Zn(s)+ HgO(s)= ZnO(s)+ Hg(l)的反应热ΔH为 |
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A.-260.4 kJ·mol-1 B.+260.4 kJ·mol-1 C.- 441.8 kJ·mol-1 D.+ 441.8 kJ·mol-1 |
已知: 3/2CO2(g)+2Fe(s) = Fe2O3(s)+3/2C(s) △H=-234.1kJ·mol-1 CO2(g) = C(s)+O2(g) △H=+393.4kJ·mol-1 则2Fe(s)+3/2O2(g)=Fe2O3(s)的△H是 |
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A.-824.2kJ·mol-1 B.-627.5kJ·mol-1 C.+861.6kJ·mol-1 D.+159.3kJ·mol-1 |
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