Q.30. Calculate the heat of combustion AH°, 298K of solid oxalic acid (C,H,O., s) at 25 °C and atmospheric pressure, using the standard molar enthalpies of formation. 1) Write the equation of this reaction and calculate, using the data, its standard enthalpy at 298K. 2) Explain why the standard enthalpy of formation of gaseous oxygen is zero? (Explain in one sentence only) Given: Standard molar enthalpies of formation at 298.15K AHF (kJ/mol) -829.9 Substance and State C,H,O.(s) CH,O.(g) CO.(g) CO((aq) H,O(g) H,O() -731.8 -393 -413.26 -241.8 -285.2
Q.30. Calculate the heat of combustion AH°, 298K of solid oxalic acid (C,H,O., s) at 25 °C and atmospheric pressure, using the standard molar enthalpies of formation. 1) Write the equation of this reaction and calculate, using the data, its standard enthalpy at 298K. 2) Explain why the standard enthalpy of formation of gaseous oxygen is zero? (Explain in one sentence only) Given: Standard molar enthalpies of formation at 298.15K AHF (kJ/mol) -829.9 Substance and State C,H,O.(s) CH,O.(g) CO.(g) CO((aq) H,O(g) H,O() -731.8 -393 -413.26 -241.8 -285.2
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Q.30. Calculate the heat of combustion AH°, 298K of solid oxalic acid (CH,O., s) at 25 °C and
atmospheric pressure, using the standard molar enthalpies of formation.
1) Write the equation of this reaction and calculate, using the data, its standard enthalpy at
298K.
2) Explain why the standard enthalpy of formation of gaseous oxygen is zero? (Explain in
one sentence only)
Given:
Standard molar enthalpies of formation at 298.15K
Substance and State
A,H (kJ/mol)
-829.9
CH,O.(s)
C,H,O.(g)
CO,(g)
CO.(aq)
H,O(g)
H,O(1)
0(g)
-731.8
-393
-413.26
-241.8
-285.2
Page
6 16
ON
直 0
+
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