Ethane (C2H6) is burned with atmospheric air and the volumetric analysis of the dry products of combustion yields the following: 10% CO2, 1% CO, 3% 02 and 86% N2. Develop the combustion equation and determine (a) the percentage of the excess air (b) the air fuel ratio. (Solve for 100 kmol of dry products).

4. Pentane (C;H12) is reacted with air in an equivalence ratio (1.333). Determine the percentage analysis of the products of combustion.

One mole of C3H8, is burned with an unknown amount of air during a combustion process. An analysis of the combustion products shows that the combustion is complete and there 3 moles of free O2, in the products. Determine; - a. the actual air-fuel ration b. the equivalence ratio c. the percentage of theoretical air used during this process.

Write the complete combustion reaction of fuel oil with atmospheric air. The fuel has the following mass composition: C = 85.5%, H = 10.6% and S = 3.9%. Calculate the content of CO₂ and SO₂ in volume, on a dry basis.

One mole of Carbon Dioxide burns completely in the presence of 3 moles of diatomic oxygen in a constant volume enclosure. The original temperature and pressure of the reactants are 25 C and 1 atm. A) If combustion takes place adiabatically calculate final temeprature and pressure of the products. B) If combustion does not take place adiabatically calculate the heat transfer per mole of CO when the products are cooled to a final temperature of 500K.

4.10- Methanol is burned in an engine with air at an equivalence ratio of $=0.75. Write the balanced chemical equation. Calculate air-fuel ratio сни тог

Question No. 12: Methane CH4 is burned with stoichiometric amount of air during a combustion process. Assuming complete combustion, determine the air-fuel and fuel-air ratios.

9. Adiabatic Flame Temperature is achieved when (a) the combustion heat is the maximum (c) the combustion heat is the minimum (b) there is no loss in the heat to the surroundings (d) all products are at the same temperature has the most affinity to water to form sulfuric acid. (b) SO₂ (d) SO 10. Among all sulfur compounds, (a) SO3 (c) SO4² 11. When comparing the performance of SI engines, the (a) Indicated -efficiency is used as the measure. (b) Thermal (d) volumetric (c) mechanical 12. For a complete combustion, the reaction time should be longer than the physical time. (a) True (b) False

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2 PARTS ( A& B) solve carefully and Explain your reasoning Gaseous ethane C2H6 is burned at constant pressure P = 1atm. The reagents enter the reaction at 25°C, and the products are at 727°C. Determine the heat released by the system for ethane combustion with (a) the theoretical stechiometric amount of oxygen (b) the theoretical amount of air (air contains 3.76 kmol of nitrogen per 1 kmol of oxygen). In which case is the heat released by the system larger? Explain why.