CHEM1B - Graphing Exercise Lab Report
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CHEM1B – Section 202
Name: Whitney Bourassa
Date: 2/9/24
Graphing Exercise Lab Report
OBJECTIVE(S): In this lab exercise, we will learn how to transfer data from our experiment and use it in Excel. In Excel, we will learn how to calculate our data in the software program and take that data to create a scatter plat using graphing software. Within our graph we will learn how to create a trendline and interpret the data from our newly made graph. METHODS:
The procedures for this experiment were taken from lab manual: Valentin, J. et al, General Chemistry
II (Chemistry 1 B) Experiments. (2020 Version). Evergreen Valley College, San Jose, CA.
DATA/RESULTS:
Exercise #1: Graphing and calculating using the “heat of reaction” equation to determine ∆H˚
(heat of reaction or heat of enthalpy for a reaction)
Version #: 10
Calculation and Results: keq
T(Kelvin)
1/T(1/K)
ln K
1054
1432 0.000698 6.960348
365
1599 0.000625 5.899897
130
1744 0.000573 4.867534
86
1911 0.000523 4.454347
Graph of ln
K
eq
vs. 1/T:
1
Slope of Curve (from graph) =
14871
Value of R (with units) =
8.314 J K-1 mol-1
∆H˚
(in joules) =
-123637.5 J
Exercise #2: Graphing and calculating using the Arrhenius equation to determine E
a
(Activation Energy)
Version #: 10
Calculation and Results: k(L mol-1 s
T (K)
1/T(1/K)
ln k
0.0514
278 0.003597
-2.96812
0.123
298 0.003356
-2.09557
0.202
308 0.003247
-1.59949
0.352
318 0.003145
-1.04412
Graph of ln
k
vs. 1/T:
Slope of Curve (from graph) =
-4183.3
Value of R (with units) =
8.314 J K-1 mol-1
2
Show your calculations for ∆H˚
here:
delta H= -(14871)(8.314) J= -123637.5 J
Show your calculations for E
a
here:
Ea=-(-4183.3)(8.314)= 34779.95= 34780.0 J
E
a
(in joules) =
34780.0 J
Post-Lab Questions: The post-lab questions are on Canvas. Please go there to answer all the questions pertaining to this assignment. (Nothing to submit for this section.)
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