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Question
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
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