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已知:①N2O(g)+3H2(g)═N2H4(l)+H2O(l)△H1 ②N2(g)+3H2(g)═2NH3(g)△H2 ③2NH3(g)+3N2O(g)═4N2(g)+3H2O(l)△H3 ...

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a<c<0         b>d>0   2a=b<0  2c=d>0  
N2H4 (g) +O2(g) =N2(g)+H2O (g) △H=+267kJ/mol    N2H4 (g) + O2(g) =N2(g)+2H2O (g) △H=-534kJ/mol    N2H4 (g) + O2(g) =N2(g)+2H2O (g) △H=+534kJ/mol    N2H4 (g) + O2(g) =N2(g)+2H2O (l) △H=-133.5kJ/mol  

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