Carla and her friends were tasked with determining the heat of reaction for the neutralization of the newly synthesized monoprotic acid HX and NaOH. The rubber ball calorimeter was initially calibrated using the reaction of 15.0 mL of 0.100 M HCl and 20.0 mL of 0.0500 M KOH. This measured a temperature rise from 26.5 °C to 31.8 °C. 5.00 mL, 1.00 M NaOH, and 10.0 mL, 1.00 M HX. This showed an increase in temperature of 3.6 °C. Determine the experimental enthalpy (in kJ/mol) for the neutralization reaction between HX and NaOH. Specify if the reaction is endothermic or exothermic.
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.
Carla and her friends were tasked with determining the heat of reaction for the neutralization of the newly synthesized monoprotic acid HX and NaOH. The rubber ball calorimeter was initially calibrated using the reaction of 15.0 mL of 0.100 M HCl and 20.0 mL of 0.0500 M KOH. This measured a temperature rise from 26.5 °C to 31.8 °C. 5.00 mL, 1.00 M NaOH, and 10.0 mL, 1.00 M HX. This showed an increase in temperature of 3.6 °C.
Determine the experimental enthalpy (in kJ/mol) for the neutralization reaction between HX and NaOH. Specify if the reaction is endothermic or exothermic.
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