What Drives Chemical Reactions D.2 Energy Cycles in Reactions (id: 594333a31)

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]
Liquid dinitrogen te b 1a(sa*iiaq.dk2sa 2l/bk.y tt k3rgzm2m9( cdj-og6 roxide ($N_2O_4$) is converted to gaseous nitrogen dioxide when heated, as shown in the diagram. No other molecules react or form during this reaction.


The standard enthalpy change of the reaction,ΔH$_r^θ$, is +85.8kJmol$^{-1}$.The standard enthalpy of formation of gaseous $NO_2$ , ΔH$_r^θ$($NO_2$), is +33.1kJmol$^{-1}$.
What is the standard enthalpy of formation of liquid $N_2O_4$,ΔH$_r^θ$($N_2O_4$)?

A. -52.7kJ mol$^{-1}$
B. -19.6kJ mol$^{-1}$
C. +19.6kJ mol$^{-1}$
D. +52.7kJ mol$^{-1}$


参考答案:  B


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