For a zero order reaction with initial concentration [R]0 = 0.50 mol L…

Question

For a zero order reaction with initial concentration [R]0 = 0.50 mol L^-1 and rate constant k = 1.0 x 10^-2 mol L^-1 s^-1, what is the half-life?

Accepted Answer

C. 25 s

1. For zero order, $t_{1/2} = \dfrac{[R]_0}{2k}$.
2. $= \dfrac{0.50}{2	imes1.0	imes10^{-2}}$.
3. $= \dfrac{0.50}{0.02} = 25\ 	ext{s}$.
4. Distractor B forgets the factor 2; distractor D wrongly uses the first order formula 0.693/k.
_Source: syllabus Chemistry Ch 3 "Chemical Kinetics", p.16_

Answer

100 s

Answer

50 s

Answer

69.3 s

For a zero order reaction with initial concentration [R]0 = 0.50 mol L^-1 and rate constant k = 1.0 x 10^-2 mol L^-1 s^-1, what is the half-life?

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