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【单选题】
已知 298K 时反应 2HCl(g) → H 2 (g)+Cl 2 (g) 的 =184.6kJ · mol -1 ,则 HCl(g) 的标准摩尔生成焓等于( )。A.
-184.6kJ · mol -1 ；
B.
184.6kJ · mol -1 ；
C.
-92.3kJ · mol -1 ；
D.
92.3kJ · mol -1 。
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