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

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?

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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