Q.30. Calculate the heat of combustion AH,°, 298K of solid oxalic acid (C2H2O4, 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 AşH® (k/mol) C2H2O4(s) -829.9 C2H2O4(g) -731.8 CO2(g) -393 CO2(aq) H2O(g) H2O(1) -413.26 -241.8 -285.2 O2(g)

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Q.30. Calculate the heat of combustion AH, , 298K of
solid oxalic acid (C2H2O4, 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)
C2H2O4(s)
-829.9
C2H2O4(g)
-731.8
CO2(g)
-393
CO2(aq)
-413.26
H2O(g)
-241.8
H2O(1)
-285.2
O2(g)
Transcribed Image Text:Q.30. Calculate the heat of combustion AH, , 298K of solid oxalic acid (C2H2O4, 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) C2H2O4(s) -829.9 C2H2O4(g) -731.8 CO2(g) -393 CO2(aq) -413.26 H2O(g) -241.8 H2O(1) -285.2 O2(g)
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