The following reaction is being studied: MX (s) ⟶ M+ (aq) + X-(aq) ∆Hrxn = ??? kJ/mol MX To find the ∆Hrxn, I grab a calorimeter, and fill with 29.1 g of DI water, which is found to be at a temperature of 22.2 ˚C. I measure out 3.707 g of MX, and place it in the water and stir, while monitoring the temperature of the solution. I find that the temperature of the solution reaches a maximum of 24.5 ˚C. Also, the molar mass of MX is 70.39 g/mol. HINT: Assume the specific heat of the solution is the same as the specific heat of water. What is the ∆Hrxn (kJ/mol MX)?
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.
The following reaction is being studied:
MX (s) ⟶ M+ (aq) + X-(aq)
∆Hrxn = ??? kJ/mol MX
To find the ∆Hrxn, I grab a calorimeter, and fill with 29.1 g of DI water, which is found to be at a temperature of 22.2 ˚C. I measure out 3.707 g of MX, and place it in the water and stir, while monitoring the temperature of the solution. I find that the temperature of the solution reaches a maximum of 24.5 ˚C.
Also, the molar mass of MX is 70.39 g/mol.
HINT: Assume the specific heat of the solution is the same as the specific heat of water.
What is the ∆Hrxn (kJ/mol MX)?
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