When 15.0 mL of 3.00 M NaOH was mixed in a calorimeter with 13.0 mL of 3.00 M HCl, both initially at room temperature (22.0 °C), the temperature increased to 29.1 °C. The resultant salt solution had a mass of 28.00 g and a specific heat capacity of 3.74 J K-1 g-1. What is the heat capacity of the calorimeter (in J/°C)? Note: The molar enthalpy of neutralization per mole of HCl is -55.84 kJ mol-1 2. When 13.91 mL of HCl of unknown concentration (but less than that of the base) are reacted with 15.00 mL of 3.161 M NaOH, 1.47 kJ of heat are released. What is the molarity of the HCl solution?
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.
1. When 15.0 mL of 3.00 M NaOH was mixed in a calorimeter with 13.0 mL of 3.00 M HCl, both initially at room temperature (22.0 °C), the temperature increased to 29.1 °C. The resultant salt solution had a mass of 28.00 g and a specific heat capacity of 3.74 J K-1 g-1. What is the heat capacity of the calorimeter (in J/°C)?
Note: The molar enthalpy of neutralization per mole of HCl is -55.84 kJ mol-1
2. When 13.91 mL of HCl of unknown concentration (but less than that of the base) are reacted with 15.00 mL of 3.161 M NaOH, 1.47 kJ of heat are released. What is the molarity of the HCl solution?
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