Determine the calorimeter heat capacity using the known enthalpy of combustion o
ID: 500177 • Letter: D
Question
Determine the calorimeter heat capacity using the known enthalpy of combustion of benzoic acid.
Sample
Tablet Weight(g)
Initial Temp(K)
Final Temp(K)
Wirelength(cm)
Wire left length(cm)
Benzoic Acid
0.99
294.35
296.75
9.3
0
Benzoic Acid(2)
1.01
295.25
297.85
9.3
0.8
Naphthalene
.98
294.95
298.75
9.3
1.0
Naphthalene(2)
1.07
295.05
301.95
9.3
0.5
Sample
Tablet Weight(g)
Initial Temp(K)
Final Temp(K)
Wirelength(cm)
Wire left length(cm)
Benzoic Acid
0.99
294.35
296.75
9.3
0
Benzoic Acid(2)
1.01
295.25
297.85
9.3
0.8
Naphthalene
.98
294.95
298.75
9.3
1.0
Naphthalene(2)
1.07
295.05
301.95
9.3
0.5
Explanation / Answer
Determination of calorimeter heat capacity
moles of benzoic acid = 0.99 g/122 g/mol
= 0.008 mols
Enthalpy of combustion of benzoic acid = 3226 kJ/mol
So,
Heat released to calorimeter = 3226 kJ/mol x 0.008 mol
= 25.808 kJ
Heat capacity of calorimeter = 25.808/(296.75 - 294.35)
= 10.753 kJ/K
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