Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
Related questions
Question
Please help with 8A and 8B
Transcribed Image Text:Use the graph from worksheet question 8 to calculate the activation energy of the reaction in units of kJ/mol.
R=8.514J
mot-K
Type your answer..
Transcribed Image Text:8. The rate constant for a reaction was measured as a function of temperature, as shown below. Use
Excel to create a graph of In(k) vs 1/T. Insert a linear trendline and use the trendline equation to
calculate the activation energy for the reaction.
Temp (K)
k (s1)
284.35
0.00111
297.35
0.00260
307.45
0.00498
320.25
0.01031
Expert Solution
Step 1
Rate constant k is related to the activation energy of a reaction by Arrhenius equation.
k = rate constant
A = pre-exponential factor
Ea = activation energy
R = Universal gas constant
T = Temperature.
Taking natural logarithm in both side of equation 1,
Step by step
Solved in 3 steps with 4 images
![em1.png Part 3: Q9 Average absorbance Flask 8 Flask 9 Flask 10 1:1 Ratio so, Flask 11 Part 3: Q Flask 8 Flask 9 Flask 10 Flask 11 Part 3: Q10 Flask 8 Flask 9 Flask 10 Flask 11 Part 3 0.146 0.166 [Fe] -0.002mol/L 0.215 0.294 [FESCN³mol/L) 4.59% 10 5.18*10* 6.64*10* 9.08*10* [FXmol/L) 5.00 *10* 5.00*10* Y=3362x-0.0083 R² = 0.9993 5.00*10* 5.00*10* (Amounts of flask 8 (9 - 11's values are in the spreadsheet) 71% volume 5.00mL Molarity of Fe(NO3))3 = 0.2M Volume of Fe(NO3))3 = 5.00mL Moles of Fe³= Molarity x volume(L) Moles of Fe¹ = 0.2M X 0.005L = 1x10-³mole x [SCN][mol/ 4x10 5×10-4 7x10 1×10 1 Concentration of Fe³ = mole of Fe³ Volume mole of Fe³1x10³ mole G.O05L 8, Average absorbance for solution 8 (same for 9 - 11) Average absorbance for flask 8 = sum of all absorbances / number of readings (0.145 +0.147 +0.148) 3 Using equation of calibration curve's line(slope) of best fit, the average absorbances of the unknown concentrations to determine [FeSCN-Jat equilibrium in solution 8:…](/questions-and-answers/em1.png-...-part-3-q-average-absorbance-flask-and-11-ratio-so-flash-d-flask-10-flask-11-part-3-q-fla/c9657571-599f-4ed4-a5e6-fabcbd26b888){kind=link}
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