已知反应 A→2B 的速率方程为r=kcA,则该反应的半衰期t1/2为( )
A: 2ln2/k
B: ln2/2k
C: 4ln2/k
D: ln2/k
A: 2ln2/k
B: ln2/2k
C: 4ln2/k
D: ln2/k
举一反三
- 一级反应半衰期公式为() A: t1/2=0.1054/k B: t1/2=0.693/k C: t1/2=Co/2k D: t1/2=0.693k E: t1/2=1/Cok
- 一级反应半衰期的公式为() A: t1/2=0.1054/k B: t1/2=0.693/k C: t1/2=0.693k D: t1/2=C0/2k E: t1/2=1/C0k
- 已知\( y = \cos (2 + \ln 3) \),则\( y' \)为( ). A: 0 B: \( \cos (2 + \ln 3) \) C: \( - \sin (2 + \ln 3) \) D: \( - {1 \over 3}\sin (2 + \ln 3) \)
- 一级反应半衰期公式为( ) A: t1/2=0.1054/k B: t1/2=0.693/k C: t1/2=Co/2k D: t1/2=0.693k E: t1/2=0.1/Cok
- 知反应N2+3H2= 2NH3的标准平衡常数为Kө1,反应的标准平衡常数为Kө2,两者的关系为() A: Kө1=Kө2 B: Kө1=2Kө2 C: Kө1=1/2Kө2 D: Kө1=(Kө2)2