Liquid sulfur at 130C and pure oxygen at 25C are mixed at st

Liquid sulfur at 130?C and pure oxygen at 25?C are mixed at stoichiometric ratio and fed to a burner, where complete oxidation of sulfur to SO2 takes place. The burner is perfectly insulated, the pressure is 1 atm, and the system operates at steady state. What is the temperature of the exiting stream?

SO Ss)SO (302(3) 32 Cp(J/) mol c 23.2 39.9 29.3

Solution

Enthalpy of liquid sulphur = Cp* T = 12.896 KJ/mol

Enthalpy of O2 entering = Cp*T = 8.7314 KJ/mol

After complete oxidation the system would only be having SO2 with a energy which is sum of both the enthapies i.e. the enthalpy of SO2 after oxidation = 21.6274 KJ/mol

So, as Cp SO2 = 39.9 and enthalpy of stream exiting = Cp* T So, temperature = 269.04 oC