12.“熵”可看作是“混乱度”,它的符号是“S”。下列变化中,△S<0(“混乱度”减小)的是
A.3Fe(s)+4H2O(g) =Fe3O4(s)+4H2(g) |
B.2NO2(g) =N2O4(l) |
C.2IBr(l) =I2(s)+Br2(g) |
D.(NH4)2CO3(s) =2NH3(g)+CO2(g)+2H2O(g) |
12.“熵”可看作是“混乱度”,它的符号是“S”。下列变化中,△S<0(“混乱度”减小)的是
A.3Fe(s)+4H2O(g) =Fe3O4(s)+4H2(g) |
B.2NO2(g) =N2O4(l) |
C.2IBr(l) =I2(s)+Br2(g) |
D.(NH4)2CO3(s) =2NH3(g)+CO2(g)+2H2O(g) |