6. A high grade semi-anthracite coal has a complete analysis of 85.86% C, 4.44% H, 2.7% O, 1.2N, 5% ash and 0.8% S. Analysis of the Residue shows 58% C and 42% ash. Air is supplied dry at 30°C and 750 mm Hg. Partial orsat analysis of the stack gas (400 °C , 755 mm Hg) shows 8.05% CO2 , 2.42% CO and 2.9% H2 . Assume that the S and N gasified burns to SO2 and NO respectively. Calculate: а) % excess 02 b) Complete orsat analysis of stack gas (10.611% O2 , 75.843 % N2 , 0.04% SO2, 0.136% (54.4) NO) 3 c) m stack gas/ m³ air (2.313)

The lower heating value for gaseous n-octane is 44,791 kJ/kg, and its latent heat of vaporization is 300 kJ/kg. Using this information, determine the enthalpy of formation at 298 K for liquid n-octane in kJ/kmol. (Here you are to compute the enthalpy of formation from the given information, not look it up in a property table.)

Estimate the heat of vaporization of diethyl either normal boiling point using troutons rule and Chen's rule and compare the results with a tabulated value of this quantity. Calculate the percentage error that results from using each estimation. The estimate the change in the heat of vaporization at 100°c using the Watson correlation.

Calculate the heat capacity for formaldehyde at 25°C. Answer should be in kJ/kgmol°C