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.
A 150.0 mL sample of 0.20 M NaOH is mixed with 150.0 mL of 0.20 M HF solution both with an initial temperature of 24.5 ̊C. The reaction below occurs and the temperature of thesolution rises to 25.8 ̊C. What is the H for the reaction:NaOH(aq) + HF(aq) H2O(l) + NaF(aq)
6.Write the equation for the standard formation of one mole of HF(g) from the pure elements.
7.Using the following standard enthalpies of reaction4NH3(g) + 7 O2(g) 4 NO2(g) + 6 H2O(l)H ̊rxn= -1395 kJN2(g) + 2 O22 NO2(g)H ̊rxn= +67.4 kJFind the standard enthalpy of reaction for the equation:2N2(g) + 6 H2O(l) 4 NH3(g) + 3 O2(g)
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