448℃时反应H 2(g)+I 2(g)⇌2HI(g),平衡常数K=
[HI ] 2
[ H 2 ][ I 2 ] =49;反应HI(g)⇌
1
2 H 2(g)+
1
2 I 2(g)的平衡常数K=
[ H 2 ]
1
2 [ I 2 ]
1
2
[HI] =
1
49 =
1
7 ;
故选D.
448℃时反应H 2(g)+I 2(g)⇌2HI(g),平衡常数K=
[HI ] 2
[ H 2 ][ I 2 ] =49;反应HI(g)⇌
1
2 H 2(g)+
1
2 I 2(g)的平衡常数K=
[ H 2 ]
1
2 [ I 2 ]
1
2
[HI] =
1
49 =
1
7 ;
故选D.