A calorimeter contains 34.0 mL of water at 14.0 °C . When 2.30 g of X (a substance with a molar mass of 82.0 g/mol ) is added, it dissolves via the reaction X(s) + H2O(1)→X(aq) and the temperature of the solution increases to 25.5 °C . Calculate the enthalpy change, AH, for this reaction per mole of X. Assume that the specific heat of the resulting solution is equal to that of water [4.18 J/(g•°C)], that density of water is 1.00 g/mL, and that no heat is lost to the calorimeter itself, nor to the surroundings. Express the change in enthalpy in kilojoules per mole to three significant figures. View Available Hint(s) AH =– 57.2 kJ/mol
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.
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![Part A
A calorimeter contains 34.0 mL of water at 14.0 °C. When 2.30 g of X (a substance with a molar mass of 82.0
g/mol ) is added, it dissolves via the reaction
X(s) + H20(1)→X(aq)
and the temperature of the solution increases to 25.5 °C .
Calculate the enthalpy change, AH, for this reaction per mole of X.
Assume that the specific heat of the resulting solution is equal to that of water [4.18 J/(g · °C)], that density of water
is 1.00 g/mL, and that no heat is lost to the calorimeter itself, nor to the surroundings.
Express the change in enthalpy in kilojoules per mole to three significant figures.
View Available Hint(s)
Πν ΑΣφ
?
AH = | – 57.2
kJ/mol
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In the calculation of q , the total mass of reactant and water is needed. You may have used just the mass of
the water.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fded90a0e-1aa2-42d3-8902-387fb21746ad%2F3262fb3d-c7ec-478a-bccc-0abb242092e6%2Fd0cisf8_processed.png&w=3840&q=75)
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