Determine the calorimeter heat capacity using the known enthalpy of combustion of benzoic acid. Sample Tablet...

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

Solutions

Expert Solution

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

queen_honey_blossom answered 1 year ago

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