Question

For the above reaction, the slope is -0.016. What are the units of the slope and what is k? Note, logs are unitless! Additional hint given in feedback. Select one or more: a. units: M/s b. units: 1/s c. units: 1/(Ms) d. k = -0.016 M/s e. k = +0.016 M/s f. k = -0.016 1/s g. k = +0.016 1/s h. k = -0.016 1/(Ms) i. k = +0.016 1/(Ms)

Answer 1

Slope = M / s

k = +0.016 / s

Step-by-step explanation:

Given:

- A first order reaction ---- (missing from question)

- Slope is -0.016

Find:

Units of Slope and value of k

Solution:

- The slope of the concentration time graph is called the rate of reaction. For which the rate of reactions is always expressed as change in concentration of reactants per unit time. Hence,

Slope = Change in concentration / time

Slope = M / s

- The units of k constant depends on the order of reaction. The graph given is of first order. Hence, the sum of moles of reactants and products is the same. Hence, the units of constant k is given by:

k = +0.016 / s