1.
(2019高二上·辽源期中)
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。则下列热化学方程式中正确的是（ ）
A . 1/2N2H4(g)＋1/2O2(g)=1/2N2(g)＋H2O(g) ΔH＝＋267 kJ·mol－1
B . N2H4(g)＋O2(g)=N2(g)＋2H2O(g) ΔH＝－534 kJ·mol－1
C . N2H4(g)＋O2(g)=N2(g)＋2H2O(g) ΔH＝＋534 kJ·mol－1
D . N2H4(g)＋O2(g)=N2(g)＋2H2O(l) ΔH＝－133.5 kJ·mol－1
