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

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Reactive Processes

Reactive processes are the processes in which any reaction occurs. The reactions can be any combination reaction, decomposition reaction, combustion reaction, oxidation reaction, reduction reaction, neutralization reaction, displacement reaction, or double displacement reaction.