Share
Explore BrainMass

Finding Concentration with Excel Graph

Solution to be listed in Excel Graphs

The initial speed of formation of a substance X depends on the concentration as it follows:

C x*103 [M] 5.0 8.2 17 30
Vx, 0*107 [Ms-1] 3.6 9.6 41 130

Find the order of the reaction and the constant of speed.
Solution:
Let the order of reaction be "m" and constant of speed k.
Then,
Vx=k[Cx]m
Hint: plot ln[Cx] on x-axis and ln[Vx] on y-axis
Slope will give order m and intercept will give k

Exercise 3

The concentration of a species Y and varies with time in agreement with:
t [s] 0 200 600 1000
C [M] 0.110 0.073 0.032 0.014
Speed of reaction(Vx)
M/s (0.110-0.073)/200=
1.85*10^-4 (0.073-0.032)/(600-200)=1.03*10^-4 (0.032-0.014)/(1000-600)=0.450*10^-4

Solution:
Let the order of reaction be "m" and constant of speed k.
Then,
Vx=k[C]m
Hint: plot ln[C] on x-axis and ln[Vx] on y-axis
Slope will give order m and intercept will give

Exercise 6
To obtain A and Ea from the following data:
T [K] 300 350 400 450 500
k* 10-8 [s-1] 0.079 0.30 0.79 1.7 3.2

Solution:
K=Ae-Ea/RT
Or
ln(k) = lnA-(Ea/RT)
HINT:plot ln(k) on y-axis and 1/T on x-axis,
Then slope of line =-Ea/R gives Ea and intercept will give A

Solution Summary

This solution shows step-by-step calculations to determine the order of reaction and the constant speed of various chemical reactions. Graphs showing the intercept and the slope are also included.

$2.19