Ethane gas (C2H6) at 25°C is burned in a steady-flow combustion chamber at a rate of 5 kg/h with the stoichiometric amount of air, which is preheated to 500 K before entering the combustion chamber. An analysis of the combustion gases reveals that all the hydrogen in the fuel burns to H2O but only 95 percent of the carbon burns to CO2, the remaining 5 percent forming CO. If the products leave the combustion chamber at 800 K, determine the rate of heat transfer from the combustion chamber.

A sample of 260.0 of liquid water is initially at a temperature of 75.0ºC. If that water is heated by the combustion of 26.00 grams of coal (carbon) to form carbon dioxide. Assume all the heat from combustion goes into the water. Determine the final state and temperature of the H2O. Explain the determination of the energy produced by combustion of the coal, the amount of energy used to heat the liquid water, the energy needed to vaporize the liquid water, and the final temperature determination.

A single effect evaporatoris being used to concentrate 8000 kg/h of tomato juice from 5% total solids to 30% total solids. The juice enters the evaporator at 25°C. The evaporator is operated with steam (80% quality) at 143.27 kPa. The vacuum inside the evaporator allows the juice to boil at 80 ° C. The specific heat of the liquid feed is 4.1 kJ/(kg°C) and the concentrated product is 3.1 kJ/(kg°C). Calculate(a) the steam requirements = Answer kg / hour.(b) steam economy for the process. Assume the condensate is discharged at 75°C. = Answer (kg of water evaporates / kg of steam)