1.某一藥物之降解遵循第一階次(first order)動力學過程,請問其半衰期(t1/2)及第一階次速率常數(k)之間的關係為何?
(A)t1/2 = 0.693/k
(B) t1/2 = k/0.693
(C) t1/2 = 1/2 (C/k)
(D) t1/2 = 1/2 (k/C)
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統計: A(8118), B(168), C(44), D(10), E(0) #882788
統計: A(8118), B(168), C(44), D(10), E(0) #882788
詳解 (共 4 筆)
#1251629
一階次
公式Cp =Co x e-ktCp =0.5Co 代入
-0.5= e-kt
ln 0.5 =kt , t=ln0.5/k=0.693/k
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#5229355
| Zero order 零級反應 | First order 一級反應 |
| C = C0 - kt | C =C0 e-kt |
| t1/2 = 0.5D0 / k | t1/2 = 0.693 / k |
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0