已知I2(g)+H2(g)2HI(g)△H=-QkJ/mol(Q>0),H-H键能为akJ/mol,H-I键能为bkJ/mol,则I-I键能是
A.b+Q-a kJ/mol |
B.2b-Q-a kJ/mol |
C.2b+Q-a kJ/mol |
D.b-Q+a kJ/mol |
已知I2(g)+H2(g)2HI(g)△H=-QkJ/mol(Q>0),H-H键能为akJ/mol,H-I键能为bkJ/mol,则I-I键能是
A.b+Q-a kJ/mol |
B.2b-Q-a kJ/mol |
C.2b+Q-a kJ/mol |
D.b-Q+a kJ/mol |