A.H2(g)+
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B.2H2(g)+O2(g)=2H2O(1);△H=-142.9KJ/mol | ||
C.2H2(g)+O2(g)=2H2O(g);△H=-571.6KJ/mol | ||
D.2H2(g)+O2(g)=2H2O(1);△H=+571.6KJ/mol |
A.已知2H2(g)+O2(g)=2H2O(g);△H=-483.6kJ/mol,则氢气的燃烧热为241.8kJ | ||||
B.已知4P(红磷,s)=P4(白磷,s);△H>0,则白磷比红磷稳定 | ||||
C.含20.0g NaOH的稀溶液与稀硫酸完全中和,放出28.7kJ的热量,则表示该反应中和热的热化学方程式为:NaOH(aq)+
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D.己知C(s)+O2(g)=CO2(g);△H1C(s)+
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1 |
2 |
nA |
tA |
n(H2) |
n(CH3OH) |
1 |
2 |
1 |
2 |
A.它们都是吸热反应 | B.2 a=c |
C.a=b | D.a,b和c均为负值 |
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