a) A reaction has a rate constant, k = 1.93 s-1. What is the half-life (seconds) when the initial concentration is 0.698

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answerhappygod
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a) A reaction has a rate constant, k = 1.93 s-1. What is the half-life (seconds) when the initial concentration is 0.698

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a) A reaction has a rate constant, k = 1.93
s-1. What is the half-life (seconds) when the initial
concentration is 0.698 M?
b)The rate of a particular chemical reaction follows first order
kinetics with a rate constant, k = 0.050
s-1. If the initial concentration of the reactant is
5.67 M and the final concentration of the reactant is 1.92 M, how
long (seconds) does it take for the reaction to happen?
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