Consider the following reaction and the given thermodynamic data at 25°C. MgO(s) + 2HCl(aq) → MgCl2(aq) + H2O(1) Compound AH/kJ mol-1 MgO(s) -601.8 HCl(aq) -167.16 MgCl2(aq) H₂O(1) -641.6 -285.8 (a) Define the term standard enthalpy change of formation, AH°f. (1 marks) (b) Write a thermochemical equation for AH [MgCl2(aq)]. (2 marks) (c) Calculate AH°r rxn at 25°C. (2 marks) (d) Under constant pressure situation, what is the relationship between heat of reaction, q, and the enthalpy change of reaction, AH°rxn. Explain your answer by calculations. (2 marks)
Consider the following reaction and the given thermodynamic data at 25°C. MgO(s) + 2HCl(aq) → MgCl2(aq) + H2O(1) Compound AH/kJ mol-1 MgO(s) -601.8 HCl(aq) -167.16 MgCl2(aq) H₂O(1) -641.6 -285.8 (a) Define the term standard enthalpy change of formation, AH°f. (1 marks) (b) Write a thermochemical equation for AH [MgCl2(aq)]. (2 marks) (c) Calculate AH°r rxn at 25°C. (2 marks) (d) Under constant pressure situation, what is the relationship between heat of reaction, q, and the enthalpy change of reaction, AH°rxn. Explain your answer by calculations. (2 marks)
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter17: Chemcial Thermodynamics
Section: Chapter Questions
Problem 17.104QE: What is the sign of the standard Gibbs free-energy change at low temperatures and at high...
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![Consider the following reaction and the given thermodynamic data at 25°C.
MgO(s) + 2HCl(aq) → MgCl2(aq) + H2O(1)
Compound
AH/kJ mol-1
MgO(s)
-601.8
HCl(aq)
-167.16
MgCl2(aq)
H₂O(1)
-641.6
-285.8
(a) Define the term standard enthalpy change of formation, AH°f.
(1 marks)
(b) Write a thermochemical equation for AH [MgCl2(aq)].
(2 marks)
(c) Calculate AH°r rxn at 25°C.
(2 marks)
(d) Under constant pressure situation, what is the relationship between heat of reaction,
q, and the enthalpy change of reaction, AH°rxn. Explain your answer by
calculations.
(2 marks)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F94a11074-6e8c-43d7-8086-a5c1f8fd1a51%2Fbfba9a60-4335-4db1-8298-e9e05a864ace%2F835hv9t_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Consider the following reaction and the given thermodynamic data at 25°C.
MgO(s) + 2HCl(aq) → MgCl2(aq) + H2O(1)
Compound
AH/kJ mol-1
MgO(s)
-601.8
HCl(aq)
-167.16
MgCl2(aq)
H₂O(1)
-641.6
-285.8
(a) Define the term standard enthalpy change of formation, AH°f.
(1 marks)
(b) Write a thermochemical equation for AH [MgCl2(aq)].
(2 marks)
(c) Calculate AH°r rxn at 25°C.
(2 marks)
(d) Under constant pressure situation, what is the relationship between heat of reaction,
q, and the enthalpy change of reaction, AH°rxn. Explain your answer by
calculations.
(2 marks)
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