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

(provide a complete solution with readable handwritting) Combustion is one of the basic reactive processes found in the chemical process industry. 200 kg/hr of calcium carbide reacted with water and the acetylene collected was burned with 24% excess air. The fractional conversion of carbon to CO2 is 0.87 and the remaining carbon burns to carbon monoxide. Determine the molar flowrate of the combustion product gas and its molar composition. Assumptions:Air is composed of 21% oxygen and 79% nitrogen. Nitrogen is inert and does not participate in the reaction. All the hydrogen reacts to form water vapor.

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Problem 3 Dibutyl phthalate (diester) is produced in a CSTR operated isothermally at 112°C. The rate of formation of the di-ester from phthalic anhydride and butanol being very fast, the controlling step, in the presence of sulphuric acid catalyst, is the conversion of mono-ester to the diester. The liquid phase reaction is: СЫН.(СООCН:)CООН + CН,ОН A C6H4(COOC4H6)2 + H2O D B The rate of the reaction is given by the expression -TA = kC; gmol/L.h where CA is the concentration of the mono-ester in gmol/L. The value of the apparent rate constant is given by: k = 0.7628 x 10ol1.965- L/gmol.h where T is the reaction temperature in K. The initial concentration of the mono-ester is 2.84 gmol/L and the density of the reaction mixture is 0.984 kg/L. (Molar mass of diester = 278) 1. In an existing plant consisting of a CSTR of 1.1 m diameter and 1.6 m height, the volumetric feed rate is 10 L/min. (a) Find the conversion achieved in an ideal CSTR. (b) If the conversion achieved in practice 68.5%…