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【单选题】
已知某气相反T1= 400 K、p= 1.01325 × 106Pa时的熵变与T2= 800 K，p=1.01325 × 106Pa时的熵变相等，则两种条件下反应的热效应
A.
△ r H m ( T 1 ) > △ r H m ( T 2 )
B.
△ r H m ( T 1 ) = △ r H m ( T 2 )
C.
△ r H m ( T 1 ) < △ r H m ( T 2 )
D.
无法确定
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