If an illegal drug is removed from the body according to a zero-order process and the concentration drops from 300 ng/ml to 150 ng/ml in two hours, what will the concentration be after two more hours?

a. 50 ng/ml
b. 0 ng/ml
c. no right choice.

Explanation:

The integrated rate law for a zero-order reaction is

A₀ - A = kt

1. Calculate the rate constant

2. Calculate the new concentration

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