part a a certain first order reaction aproductsaproducts has a rate constant of 780103 s1s1 at 4

First, we'll recognize how many half -lifes need to pass in order for the concentration to drop

Question

PART A A certain first-order reaction (A→products) has a rate constant of 7.80×10^(-3) s^(-1) at 45 °C. How many minutes does it take for the concentration of the reactant, [A], to drop to 6.25% of the original concentration? Express your answer with the appropriate units. PART B A certain second-order reaction (B→products) has a rate constant of 1.80×10^(-3) M^(-1)⋅s^(-1) at 27 °C and an initial half-life of 300 s. What is the concentration of the reactant B after one half-life? Express your answer with the appropriate units.

          PART A 
A certain first-order reaction (A→products) has a rate constant of 7.80×10^(-3) s^(-1) at 45 °C.
How many minutes does it take for the concentration of the reactant, [A], to drop to 6.25% of the original concentration?
Express your answer with the appropriate units.

PART B 
A certain second-order reaction (B→products) has a rate constant of 1.80×10^(-3) M^(-1)⋅s^(-1) at 27 °C and an initial half-life of 300 s.
What is the concentration of the reactant B after one half-life?
Express your answer with the appropriate units.

Added by Christy M.

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