SOLVED

9.44.A dilute aqueous solution of sulfuric acid at 25oC is used to absorb ammonium in a continuous reactor , there by producing ammonium sulfur a fertilizer: (a)If the ammonium enters the absorber at 75oC , the sulfuric acid enters at 25oC and the product solution emerges at 25oC how much heat must be withdrawn from the unit per mol of (NH4)SO4 produced? 9.46.A 12.0-molar solution of sodium hydroxide solution is neutralized with 75.0 mL of a 4.0 molar solution of sulfuric acid in a well insulated container (a)Estimate the volume of the sodium hydroxide solution and the final solution temperature if both feed solutions are at 25oC . The heat capacity of the product solution may be taken to be that of pure liquid water the standard heat of solution of sodium sulfate is -1.17 kJ/mol and the energy balance reduces to Q = ΔH for this constant pressure batch process. 9.48.A natural gas is analyzed and found to consist of 87.5%v/v methane 7.0% ethane 2.0 % propane and 3.5% N2 (a)Calculate the higher heating value and the lower heating value of this fuel in kJ/mol , using the heats of combustion in table B.1. 9.50.A fuel gas is known to contain methane ethane and carbon monoxide A sample of the gas is charged into an initially evacuated 2.000liter vessel at 25oC and 2323 mm Hg absolute The vessel is weighed before and after being charged and the mass difference is found to be 4.929 g . Next the higher heating value of the gas is determined in a calorimeter to be 841.9 kJ/mol .Calculate the molar composition of the gas. 9.52.A mixture of air and a fine spray of gasoline at ambient temperature is fed to a set of piston effect cylinders in an automobile engine .Sparks ignite the combustible mixtures in one cylinder after one month The back and forth motion of the piston is converted to rotary motion of the crank shaft (a) Take gasoline to be a liquid with the specific gravity of 0.70and a higher heating value of 49.0 Assume complete combustion and that of products leaving the engine are at 298 K and then calculate the minimum feed rate of gasoline required to produce 100hp of shaft work.