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The decomposition of NH3 on a platinum surface is a zero-order reaction. If the rate constant (k) is 4 ×10-3 ms-1 , how long will it take to reduce the initial concentration of NH3 from 0.1 M to 0. - Chemistry

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Numerical

The decomposition of NH3 on a platinum surface is a zero-order reaction. If the rate constant (k)  is 4 x 10-3 ms-1, how long will it take to reduce the initial concentration of NH3 from 0.1 M to 0.064 M?

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Solution

Given that:
k = 4 x 10-3 Ms-1

`["A"_°]` = 0.1 M

[A] = 0.064 M
For a zero-order reaction,

k=`1/t {["A"_°]-["A"]}`

4 x 10-3 Ms-1 = `1/"t" {[0.1]-[0.064]}`

t =`( 0.1-0.064)/(4xx10^-3)=0.009xx10^3=9` seconds

Concept: Integrated Rate Equations - Zero Order Reactions
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