1. The gas phase decomposition of nitrosyl chloride at 400 K NOCl(g) ---> NO(g)

Question

1. The gas phase decomposition of nitrosyl chloride at 400 K

NOCl(g) ---> NO(g) + ½ Cl2(g)

is second order in NOCl with a rate constant of 5.90×10-4 M-1 s-1.

If the initial concentration of NOCl is 2.40×10-2 M, the concentration of NOCl will be _______ M after 3.35×105 seconds have passed.

2.The gas phase decomposition of hydrogen peroxide at 400 °C

H2O2(g) ----> H2O(g) + ½ O2(g)

is second order in H2O2 with a rate constant of 0.650 M-1 s-1.

If the initial concentration of H2O2 is 0.199 M, the concentration of H2O2 will be 3.44×10-2 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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