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]
Using the table below, o.mf--w oaq27sk .uwechoose the corr/zxaa;5n wz4 ject expression that represents the enthalpy change for the following hydrogenation reactiozz4axa 5 /njw;n:
$C_2H_4$(g)+$H_2$(g)→$C_2H_6$(g)
Substance is $C_2H_4$(g) ; ΔH (Enthalpy of Formation) kJ mol$^{-1}$ is x
Substance is $C_2H_6$(g) ; ΔH (Enthalpy of Formation) kJ mol$^{-1}$ is y
A. −x+y kJ mol${-1}$
B. x+y kJ mol${-1}$
C. −2x+y kJ mol${-1}$
D. −2x−2y kJ mol${-1}$
参考答案: A
本题详细解析:
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