Question

please show work. i need this for a test

Question 21 1 pts The reaction AB is first order in A. Consider the following data: Time (s) [A] (M) 0.0 2.3 10.0 0.58 20.0 0.14 The rate constant for this reaction is s-1 0.013 O 0.030 O 3.1e-3 O 0.14 O 3.0

Answer 1

Question 21.

Solution:

Use the following equation to calculate the rate constant, k.

k = (2.303 / t)log([A]₀ / [A]_F) ---> (1)

t = 20 s, [A]₀ = 2.3 M, [A]_F = 0.14 M

Plug the values in (1) and solve.

k = (2.303 / 20 s)log{(2.3 M) / (0.14 M)}

k = (0.1152 s^-1)log(16.4285)

k = (0.1152 s^-1) (1.2156) = 0.14 s^-1

Hence, 5^th option is correct.