3 According to Hess's Law: AHReaction = AHsolution + AHNeutralization%3DCalculated AHRPercent Error Trial 1Trial 2Mass of stoppered flask + NaOH pellets (g)34.9834.98Mass of empty stoppered flask (g)32.4732.47Mass of NaOH (g)2.012.01Mass of Calorimeter + Solution (g)109.89109.89Mass of Calorimeter empty (g)8.788.78Mass of Solution (g)101.11101.11Initial Temperature ("C)22.8022.80Final Temperature ("C)32.2032.20AT = (Tinal - Tinitial9.49.42913.37913.379calorimeter = (0.961 cal/g "C)-(m)-(AT)-913.37-913.37Areaction = -qcalorimeter0.05020.0502# moles NaoH = 9NAOH/(40 g/mol)-18194.6-18194.6AHR = greaction /# moles NaOH (cal/mol)DFocusot Predictions: OnAccessibility: Good to go

Given, experimental value of ∆HR is -18194.6 cal/mol.

Answered: According to Hess's Law: AHReaction =…

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Chemistry

According to Hess's Law: AHReaction = AHsolution + AHNeutralization %3D Calculated AHR Percent Error

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter6: Random Errors In Chemical Analysis

Section: Chapter Questions

Problem 6.7QAP

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Question

According to Hess's Law: AHReaction = AHsolution + AHNeutralization
%3D
Calculated AHR
Percent Error

Trial 1
Trial 2
Mass of stoppered flask + NaOH pellets (g)
34.98
34.98
Mass of empty stoppered flask (g)
32.47
32.47
Mass of NaOH (g)
2.01
2.01
Mass of Calorimeter + Solution (g)
109.89
109.89
Mass of Calorimeter empty (g)
8.78
8.78
Mass of Solution (g)
101.11
101.11
Initial Temperature ("C)
22.80
22.80
Final Temperature ("C)
32.20
32.20
AT = (Tinal - Tinitial
9.4
9.42
913.37
913.37
9calorimeter = (0.961 cal/g "C)-(m)-(AT)
-913.37
-913.37
Areaction = -qcalorimeter
0.0502
0.0502
# moles NaoH = 9NAOH/(40 g/mol)
-18194.6
-18194.6
AHR = greaction /# moles NaOH (cal/mol)
DFocus
ot Predictions: On
Accessibility: Good to go

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