Question

The first column contains time in seconds and the second column the concentration of reactant in molar units.

e	0.0256
0.1	0.0195
0.2	0.0143
0.3	0.0105
0.45	0.0074
0.5	0.0066
0.6	0.0060
0.7	0.0031
0.8	0.0024
0.9	0.0031
1	0.0019
1.1	0.0022
1.2	0.0005
1.3	0.0012
1.4	0.0006
1.5	0.0009

What is the rate constant of the reaction? Be sure you include units. Use "M" for molar and "s" for seconds ?

What is the rate of the reaction at t = 0.5s? Express your answer in units of M/s​

What is the concentration of product at t = 0.5s?​

Answer 1

We will plot graph between

a) concentration and time: If it is straight line then zero order reaction

b) ln[concentration] and time: if it is straight line then first order reaction

c) 1 / [concentration] and time: if it is straight line then second order reaction

The equation from graph is

y = -2.470x - 3.775

Rate constant = -slope = 2.470 s^-1

b) rate of reaction = K[concentration] = 2.470 X [0.00660] = 0.0163 M/ s

c) concentration at t = 0.5 seconds = 0.00660 (as given)