Please explain your answer!! Chapter 19 Quiz Spl5.pdf Adobe Reader File Edit Vie

Question

Please explain your answer!!

Chapter 19 Quiz Spl5.pdf Adobe Reader File Edit View Window Help Tools Sign Comment 139% 56. A chemical reaction that is first-order in Xis observed to have a rate constant of 1.80 x 10-2 s i If the initial concentration ofX is 1.0 M, what is the concentration of X after 186 s? A) 0.035 M B) 0.67 M C) 28 M D) 0.23 M 57. The catalyzed pathway in a reaction mechanism has a activation energy and thus reaction rate. causes a A) higher, steady B) higher, lower C) higher, higher D) lower, higher 58. Which of the following statements is incorrect? A) The rates of most chemical reactions change with time. B) In a series of stepwise reactions, the rate-determining step is the slowest one. C) The rate constant for a reaction can be changed by changing the temperature. D) The rate constant is dependent on the reactant concentrations. 2:52 AM 4/30/2015

Explanation / Answer

question 1

we will use the first order equation i.e., ln(No/N) = kt

No = 1.0 M

k = 1.8 x 10 -2 S-1

t = 186

putting in equation

ln [N]= -kt + ln [No]

ln [N]= 1.8 x 10 -2 x 186   In[1]

ln [N]= 3.348   In[1]

we could calculate N here

Question 2

answer C Higher/higher

Question 3

incorrect is the rate of most chaemical reactions change with time

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