298 K 时,反应 C( 石墨 ) + 2H 2 (g) = CH 4 (g) , Δ r H m = -74.8 kJ/mol , Δ r S m = -80.7 J/(mol · K) ,则平衡常数 K y 为 ( ) 。
A.
4.6×10 6
B.
6.2×10 7
C.
7.9×10 8
D.
9.1×10 9
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