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Chem
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Is the sign of Hrxn for an exothermic reaction positive or negative? Why?
2
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21 grams of potassium hydroxide are added to 250
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14 °C
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C = 4
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Using Hess' Law, Calculate the standard heat of formation for copper(I) oxide given the following data:
CuO(s) → Cu(s) + ½ O2(g)
rH° = 157
...
0 kJ/mol
Show your work:
Data for Virtual EXP 6
Page 1 of 10
Chem
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Part A Reaction 1: Heat of Solution KNO3
Initial Temperature
_22
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8______ oC
T (from plot)
___________ not from the data above)
Mass KNO3:
__7
...
0___ (± 0
...
1E
Thermochemistry Virtual Lab
Experiment 6
Copy and paste your EXCEL KNO3 run graph here:
Data for Virtual EXP 6
Page 3 of 10
Chem
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0M________
M(NaOH)
__1
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0________ (± 0
...
0______ (± 0
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7_______ oC
T (from plot)
___________(not from the data above)
Final Temperature:
____28
...
1E
Thermochemistry Virtual Lab
Experiment 6
Copy and paste your EXCEL graph for your neutralization run here:
Data for Virtual EXP 6
Page 5 of 10
Chem
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3942____ g
______0
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0______ mL
____100
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7_____ C
______21
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9______ C
______28
...
1E
Thermochemistry Virtual Lab
Experiment 6
Copy and paste your EXCEL plot for the Mg run here:
Data for Virtual EXP 6
Page 7 of 10
Chem
...
1E
Thermochemistry Virtual Lab
Experiment 6
Hess’s Law Calculation: Refer to reactions in introduction
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9 kJ/mol
H2(g) + ½ O2(g) → H2O(l) (heat of formation of water)
Combine H°1 , H°2 & H°3 using Hess’s law to find fH° (MgO): Mg(s) + ½ O2(g) → MgO(s)
SHOW YOUR WORK HERE:
Calculated Hf° MgO:
________________________ kJ/mol
Theoretical value for Hf° MgO (Text or CRC handbook):
________________________ kJ/mol
Percent Error Experimental vs
...
1E
Thermochemistry Virtual Lab
Experiment 6
READ THESE INSTRUCTIONS CARFULLY
Lab Partner:
_____________________________
Name: _____________________________
Lab: Section: ________
Summary and Results:
Part A Reaction 1: Heat of Solution KNO3
H (Experimental)
H (theoretical )
% error
Part A Reaction 2: Heat of Solution Neutralization
H (Experimental)
H (theoretical )
% error
Part B: Enthalpy of formation of magnesium Oxide
H (Experimental)
H (theoretical )
% error
Instructor Comments:__________________________________________________________________________
Data for Virtual EXP 6
Page 10 of 10