Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
You are required to determine the specific heat capacity of colostrum. You used a constant
volume calorimeter with a heat capacity of 758 J/K and the combustion of acetylene (C2H2) to do
the experiment:
2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g) ---- ∆rH = -2610kJ
The calorimeter is filled with 1.190L of colostrum (instead of water). The density of colostrum is
1.034 g/ cm3
. When 4.413 g of acetylene is burned in excess oxygen in the bomb of the
calorimeter, the temperature of colostrum and the bomb increased from 22.5oC to 61.9oC. Show
all the steps you would follow to calculate the specific heat capacity of colostrum
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