Question

p1

P1. Write a balanced chemical equation for each combustion reaction. Assume that combustion is complete. The formulas and the line-bond structures for the compounds are given on the previous page. Write your equations so that liquid water is one of the products. Ethanol: Ethyl acetate: mm For onoh fuol'c combuetion reaction fill in the tables belo for the number of each AHr = [(4 x 413 kJ/mol for the C-H bonds in one mole of methane)+ (2 x 495 kJ/mol for two moles of 02 molecules)]- [(2 x 799 kJ/mole for one mole of CO2)+ (4 x 463 kJ/mole for two moles of H2O)] = [(2642 kJ) - (3450 k1)]= - 808 kJ of energy as the net exotherm Another way to estimate this quantity involves using the standard enthalpies of formation of the compounds involved in the reaction as discussed in Section 5.6 of the textbook Using the combustion of methane as the example and data from Appendix 4 (Table A4.3) in the text, we can estimate the standard heat of the reaction in the following way: CH (g)+2 02(g) CO:(g) 2 H2O (I) ΔΗ- Σ ΔΗ'proδιεΣ ΔΗ' ractanis rxn [(1 x-393.5 kJ/mol CO2)+ (2 x-285.8 kJ/mol H2O)] - [(1 x-74.8 kJ/mol CH) + (2 x 0 kJ/mol O2)] HO -890.3 kJ of energy as the net exotherm Different countries around the world use various alcohol/gasoline blends that are based on various laws as well as the design of the engine. Your unknown contains hexane. rather than gasoline, but the proportions in the mixture are the same. 10% ethanol / 90% hexane (E10) 85% ethanol/15 % hexane (E85) All of these percentages correspond to the volume of each component in the mixture. Fuels used in this lab: Нн H H H H H H H-C OH -C-H -C C- H H H H H H bo Ethanol biood CH,(CH2 CH, CH,CH,OH Hexane H H -H H H Ethyl acetate CH,COOCH,сH,

Answer 1

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