Chemical Kinetics Question 40

Question: The rate constant k, for the reaction N2O5(g)

2NO2(g)+1202(g) is 2.3×102s1 . Which equation given below describes the change of [N2O5] with time- [N2O5]0 and [N2O5]t correspond to concentration of N2O5 initially and at time, t [AIIMS 2004]

Options:

A) [N2O5]t=[N2O5]0+kt

B) [N2O5]0=[N2O5]tekt

C) log10[N2O5]t=log10[N2O5]0kt

D) In[N2O5]0[N2O5]t=kt

Show Answer

Answer:

Correct Answer: D

Solution:

Rate constant =2.3×102sec1 It means it is a first order reaction (because unit of rate constant is sec-1) For first order reaction K=1tlnaax

Kt=lnaax=ln[N2O5]0[N2O5]t



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