From the ∆H calculated above and the number of moles of acid neutralized in each case, calculate the molar heat of neutralization for HCl and H2SO4. In each case also write the balanced chemical equation for neutralization of each by aqueous NaOH.
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.
Using the data and heat of neutralization H2SO4 and HCl in the pictures,
From the ∆H calculated above and the number of moles of acid neutralized in each case, calculate the molar heat of neutralization for HCl and H2SO4. In each case also write the balanced chemical equation for neutralization of each by aqueous NaOH.
Using Hess’ Law, and the data in Appendix 4 of your text, calculate the expected molar ∆H of neutralization for each acid. Compare to your measured values. If there are any variations propose a possible explanation.
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