A) The gas phase decomposition of nitrosyl chloride at 400 K is second order in

Question

A) The gas phase decomposition of nitrosyl chloride at 400 K

is second order in NOCl with a rate constant of 5.90E-4 M-1s-1.

If the initial concentration of NOCl is 7.70E-2 M, the concentration of NOCl will be _____________ M after 1.35E5 seconds have passed.

The gas phase decomposition of nitrosyl chloride at 400 K is second order in NOCl with a rate constant of 5.90E-4 M-1s-1. If the initial concentration of NOCl is 7.70E-2 M, the concentration of NOCl will be _____________ M after 1.35E5 seconds have passed. B) The decomposition of ammonia on a platinum surface at 856 C is zero order in NH3 with a rate constant of 1.50E-6 Ms-1. If the initial concentration of NH3 is 1.29E-2 M, the concentration of NH3 will be 1.29E-3 M after _____________seconds have passed.

Explanation / Answer

A)
use Integrated rate law:
1/[R]t=k*t +1/[R]o
     =5.9*10^-4*1.35*10^-5+1/(7.7*10^-2)
     =92.637
[R]=0.011 M
Ans: 0.011 M

B)
use:
[R]o - [R]t = k*t
1.29*10^-2 - 1.29*10^-3 = 1.5*10^-6 * t
t= 7740 s

Ans: 7740 s

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