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, choose the correct expressiyrgu0n:ni ,7ypcq/c +t lx y,9on that represent a fa97*pnk* uprqo;jsou4.7hs the enthalpy change for the following hydrogenation rea7up ano;rk*4a9j s.h fo* qpu7ction:
$C_2H_4$(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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