Determine the molar enthalpy change for reaction 3 using Hess’s law HCl(aq) + NH3(aq) ® NH4Cl(aq) DH3 = A. In the space below, show all calculation set-ups to determine the molar heat of enthalpy, in kJ/mol HCl, of reaction 3 (DH3). All numerical answers must be rounded off to correct sig figs and with proper units. If the true value of DH3 is –52.2 kJ/mol, calculate the percent error. Round off the answer in correct sig figs.
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.
Determine the molar enthalpy change for reaction 3 using Hess’s law
HCl(aq) + NH3(aq) ® NH4Cl(aq) DH3 =
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A. In the space below, show all calculation set-ups to determine the molar heat of enthalpy, in kJ/mol HCl, of reaction 3 (DH3). All numerical answers must be rounded off to correct sig figs and with proper units. If the true value of DH3 is –52.2 kJ/mol, calculate the percent error. Round off the answer in correct sig figs. |
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