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Numerical

The decomposition of NH_{3} 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 NH_{3} 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: Zero Order Reactions

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