Hi Poblo can you help me on this assignment? (a) Determine the mass fraction of ethanol in an E10 mixture. (10 marks) (b) Determine the mole fraction of ethanol in an E10 mixture. (Remember the 10%...

Hi Poblo can you help me on this assignment? (a) Determine the mass fraction of ethanol in an E10 mixture. (10 marks) (b) Determine the mole fraction of ethanol in an E10 mixture. (Remember the 10% value refers to the volume of ethanol in the mixture in a liquid state, not in the gaseous state.) (10 marks) (c) Write a balanced stoichiometric equation for the combustion of E10 in air. (10 marks) (d) Assuming stoichiometric combustion and exhaust gases leaving the tail pipe of an E10-fuelled car at 200 °C and atmospheric pressure, what is the density of the exhaust gases? (10 marks) (e) Under the conditions specified in part (d), what is the concentration of CO2 (kmol/m3) within the exhaust products? (10 marks) Question 2 – (40 marks) Gaseous ethanol (C2H5OH) has a heat of formation of –235.3 MJ/kmol. If ethanol is burnt in air at stoichiometric conditions, a balanced combustion equation for the process is given by C2H5OH + 3 O XXXXXXXXXXN2 ? 2 CO2 + 3 H2O XXXXXXXXXXN2 Under certain conditions in a particular burner, the combustion process is actually lean and the appropriate balanced combustion equation is 0.8 C2H5OH + 3 O XXXXXXXXXXN2 ? 1.6 CO XXXXXXXXXXH2O + 0.6 O XXXXXXXXXXN2 (a) Calculate the stoichiometric fuel-air ratio on a mass basis. (10 marks) (b) Determine the lower heating value of the gaseous ethanol expressed in terms of kJ/kg-ethanol. (10 marks) (c) Calculate the adiabatic flame temperature in the case of the lean combustion process. (20 marks) Page 2 of 2 Question 3 – (60 marks) This question requires the identification of a suitable flame and an analysis of the combustion processes. For example you may choose a gas stove burner, a cigarette lighter, a candle, an oxy-acetylene flame, wood combustion, or another form of combustion which produces a visible flame. Describe the flame in detail using annotated sketches and calculations as required below. You must personally observe the flame behaviour. It is not sufficient to rely on material which other people may have presented in text books or on the internet. You are also required to determine the flow rate of the fuel. This might be done for example, by taking gas meter readings over a period of time, or perhaps by measuring the change of weight of the gas cylinder, candle, piece of wood, etc over a given interval of time. However, remember that you are dealing with flames and other devices that are likely to be very hot so take all precautions necessary to avoid getting burnt. Furthermore, you are dealing with fuels that can potentially release large amounts of energy in a very short period, so any device used should comply with relevant national standards and only use combustion devices in the manner intended by the manufacturer. You must not modify any combustion system including burners, gas bottles, fuel delivery and metering devices in any way whatsoever. (a) Present your own annotated photograph or a detailed sketch of the flame and identify the different regions of the flame which you have observed personally. (10 marks) (b) What is the fuel and what is its chemical composition? (5 marks) (c) Produce a balanced combustion equation for the process. (5 marks) (d) What is the fuel mass flow rate (the rate of consumption of the fuel) under typical conditions? Include a description of the experiment and analysis by which you obtained this flow rate. (15 marks) (e) Based on an estimate of the fuel density in its gaseous form, and an estimate of the available flow area(s), what is the fuel flow speed as it approaches the mixing and/or combustion zone? (10 marks) (f) How does the fuel and oxidant mix? Also illustrate the mixing process with a sketch. (5 marks) (g) Estimate a relevant Reynolds number for the configuration and discuss if this is consistent with the observed laminar or turbulent characteristics of the flame. (10 marks