Q13 of 36 Page 1

The decomposition of NH3 on platinum surface is zero order reaction. If 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.

For a zero order reaction,


Kt = A0 - A


(4 × 10-3 × t) = 0.1 – (0.0644)


t = 0.009 x 103 sec


= 9 sec.


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