If possible please explain why the answers that I have are incorrect. 6) The rea

Question

If possible please explain why the answers that I have are incorrect.

6) The reaction CH3-N=C ? CH3-C=N is a first-order reaction. At 230.3 °C, k = 6.29 ~ 10-45-1. If [CH3-N=C) is 1.00 x 10-3 initially, (CH3-N=C) is after 1.000 ~ 103 s. © 1.88 x 10-3 D) 4.27 x 10-3 E) 1.00 x 10-6 B) 2.34 x 10-4 A) 5.33 x 10-4 7) The following reaction is second order in [A) and the rate constant is 0.025 M-15-1: A ? B The concentration of A was 0.65 M at 33 s. The initial concentration of A was W C ) 0.24 D) 1.4 D) 1.4 E) 1.2 A) 2.4 B) 0.27 M. E) 1.2 x 10-2 C) 0.24

Explanation / Answer

Ans 6

Let the reaction is

A - - - > B

Rate constant k = 6.29*10^-4 s-1

[A0] = 1*10^-3

Time t = 1*10^3 s

[A] =?

For the first order reaction

[A] = [A0] exp (-kt)

= 1*10^-3 x exp (-6.29*10^-4 x 1*10^3)

= 1*10^-3 x exp (-0.629)

= 1*10^-3 x 0.533

= 5.33 x 10^-4

Option A is the correct answer

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