Interpretation:
The value of ΔH°rxn for combustion of lactic acid in kJ/mol has to be determined. Also, value of ΔH°f(C3H6O3) has to be determined.
Concept Introduction:
Enthalpy of reaction can be used to find heat capacity (cP). Heat capacity is the value of energy for particular substance that is required to raise substance’s temperature by 1 °C or 1 K. The expression to calculate heat capacity is as follows:
cP=qPΔT
Here, qP input of energy at constant pressure, ΔT is increase in temperature after input of energy.
The value heat capacity of unit mole substance is known as molar heat capacity and it is represented by CP. The expression of molar heat capacity is as follows:
CP=qPnΔT
Here, n is number of moles.
Also, The value heat capacity per gram is known as specific heat capacity and it is represented by csp. The expression of molar heat capacity is as follows:
csp=qPmΔT
Here, m is mass in grams.
In calorimeter, when heat is released it can only be absorbed by contents of calorimeter. This results in an increase in temperature. Since all heat released is absorbed by calorimeter thus change in enthalpy of reaction is written as follows:
ΔH=−ΔHcal
In bomb calorimeter, the expression of energy change in the reaction is written as follows:
ΔU=−cV,calΔT
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General Chemistry
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