Magnesium metal reacts with HCl according to the following balanced equation: Mg(s) + 2 HCl (aq) è MgCl2(aq) + H2(g) In an experiment to determine the enthalpy change for this reaction, we combine 0.158 g of Mg metal with enough HCl to make 100.0 mL of solution in a coffee cup calorimeter. The HCl is sufficiently concentrated so that the Mg completely reacts. The temperature of the solution rises from 25.6 0C to 32.8 0C as a result of the reaction. Find qsoln of the reaction as written. Use 1.00 g/ml as density of the solution and Csoln = 4.18 J/g *0C as the specific heat capacity of the 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.
Magnesium metal reacts with HCl according to the following balanced equation:
Mg(s) + 2 HCl (aq) è MgCl2(aq) + H2(g)
In an experiment to determine the enthalpy change for this reaction, we combine 0.158 g of Mg metal with enough HCl to make 100.0 mL of solution in a coffee cup calorimeter. The HCl is sufficiently concentrated so that the Mg completely reacts. The temperature of the solution rises from 25.6 0C to 32.8 0C as a result of the reaction. Find qsoln of the reaction as written. Use 1.00 g/ml as density of the solution and Csoln = 4.18 J/g *0C as the specific heat capacity of the solution.
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