题目
N2H4是一种高效清洁的火箭燃料。0.25 mol N2H4(g)完全燃烧生成氮气和气态水时,放出133.5 kJ热量。则下列热化学方程中正确的是( ) A.1/2 N2H4(g)+ 1/2 O2(g)= 1/2 N2(g)+ H2O(l) △H=+267kJ·mol-1 B.N2H4(g)+O2(g)=N2(g)+2H2O(l) △H=-133.5kJ·mol-1 C.N2H4(g)+O2(g)=N2(g)+2H2O(g) △H=+534kJ·mol-1 D.N2H4(g)+O2(g)=N2(g)+2H2O(g) △H=-534kJ·mol-1
答案:D