# The rate constant for the zeroth-order decomposition of NH3 on a platinum surface at 856 degrees...

## Question:

The rate constant for the zeroth-order decomposition of {eq}NH_3 {/eq} on a platinum surface at 856 degrees C is 1.50 {eq}\times {/eq} 10{eq}^{-6} {/eq} M/s. How much time is required for the concentration of {eq}NH_3 {/eq} to drop from 6.60 {eq}\times {/eq} 10{eq}^{-3} {/eq} M to 1.00 {eq}\times {/eq} 10{eq}^{-3} {/eq} M?

## Zero-Order Reactions:

In zero-order reactions, the reactant concentration is independent of the reaction rate. The reactant concentration reduction is linear with time and is expressed as:

{eq}\displaystyle N(t) = N_0 - kt {/eq}

where:

• N(t) is the reduced reactant concentration
• {eq}\displaystyle N_0 {/eq} is the initial reactant concentration
• k is the reaction rate
• t is the time

## Answer and Explanation:

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Given:

• {eq}\displaystyle k = 1.5\ \times\ 10^{-6}\ M/s {/eq} is the rate constant
• {eq}\displaystyle N_0 = 6.6\ \times\ 10^{-3}\ M {/eq} is the...

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#### Learn more about this topic: Zero Order Kinetics: Definition, Pharmacology & Examples

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Chapter 4 / Lesson 2
55K

This lesson helps you apply the principle of zero order kinetics, which is a way of describing how the body breaks down some types of medicine. You can use this knowledge to predict how long certain medicines will last when they're given to a patient.