When 2.708 g of AX (s) dissolves in 121.5 g of water in a coffee-cup calorimeter the temperature rises from 23.1°C to 33.9 °C. Calculate the enthalpy change (in kJ/mol) for the solution process. AX (s) →A*(aq) + x- (aq) Assumptions for this calculation: • The specific heat of the solution is the same as that of pure water (4.18 J/gK) • The density of water = 1.000 g/mL • The liquid's final volume is not changed by adding the solid • The calorimeter loses only a negligible quantity of heat. The formula weight of AX = 591097 g/mol. Be sure you include the correct sign for the enthalpy change. Note: Do not use scientific notation or units in your response. Sig figs will not be graded in this question, enter the unrounded value. Carmen may add or remove zeros from your response, your submission will still be graded correctly if this happens.
When 2.708 g of AX (s) dissolves in 121.5 g of water in a coffee-cup calorimeter the temperature rises from 23.1°C to 33.9 °C. Calculate the enthalpy change (in kJ/mol) for the solution process. AX (s) →A*(aq) + x- (aq) Assumptions for this calculation: • The specific heat of the solution is the same as that of pure water (4.18 J/gK) • The density of water = 1.000 g/mL • The liquid's final volume is not changed by adding the solid • The calorimeter loses only a negligible quantity of heat. The formula weight of AX = 591097 g/mol. Be sure you include the correct sign for the enthalpy change. Note: Do not use scientific notation or units in your response. Sig figs will not be graded in this question, enter the unrounded value. Carmen may add or remove zeros from your response, your submission will still be graded correctly if this happens.
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter4: Energy And Chemical Reactions
Section: Chapter Questions
Problem 65QRT
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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.
Question
Transcribed Image Text:When 2.708 g of AX (s) dissolves in 121.5 g of water in a coffee-cup calorimeter the temperature rises from
23.1 °C to 33.9 °C. Calculate the enthalpy change (in kJ/mol) for the solution process.
AX (s) →A*(aq) + x- (aq)
Assumptions for this calculation:
• The specific heat of the solution is the same as that of pure water (4.18 J/gK)
• The density of water = 1.000 g/mL
• The liquid's final volume is not changed by adding the solid
• The calorimeter loses only a negligible quantity of heat.
The formula weight of AX = 59.1097 g/mol. Be sure you include the correct sign for the enthalpy change.
Note: Do not use scientific notation or units in your response. Sig figs will not be graded in this question,
enter the unrounded value. Carmen may add or remove zeros from your response, your submission will still
be graded correctly if this happens.
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