thanks Learning Goal To understand how to use integrated rat

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Learning Goal: To understand how to use integrated rate laws to solve for concentration. A car starts at mile marker 145 on a highway and drives at 55 mi/hr in the direction of The rate constant for a certain reaction is k = 7.90 times 10_3s-1. If the initial reactant concentration was 0.100 M, what will the concentration be after 20.0 minutes? Express your answer with the appropriate units. A zero-order reaction has a constant rate of 5.00 times 10-4 M/s. If after 80.0 seconds the concentration has dropped to 5.00 times 10-2 M, what was the initial concentration? Express your answer with the appropriate units.

Solution

A)the reaction is a first order reaction.so,

ln(0.1/A)=7.9*10^-3*20*60

or A=7.64*10^-6M

b)[Ao]-[A]=kt

or [Ao]=5*10^-2+5*10^-4*80

=9*10^-2 M