What Drives Chemical Reactions D.2 Energy Cycles in Reactions (id: 7e5ae8620)

本题目来源于试卷: What Drives Chemical Reactions D.2 Energy Cycles in Reactions，类别为 IB化学

[单选题]
Given the enthalpy changeupj92 m09azeg5re l8ks f jk)c/s *t,clxor the reactions below.
$\frac{1}{2}$$N_2$(g)+$O_2$(g)→$NO_2$(g); ΔH=+33.9kJ
$NO$(g)+$\frac{1}{2}$$O_2$(g)→$NO_2$(g); ΔH=-56.5kJ
What will be the enthalpy change for:
$\frac{1}{2}$$N_2$(g)+$\frac{1}{2}$$O_2$(g)→$NO$(g)?

A. -22.6kJ
B. -90.4kj
C. +90.4kj
D. +22.6kj


参考答案:  C


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