Question

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Heat Evolved During Combustion Consider the following reaction: 2 C2H6(g)7 02(g) 4 CO2(g) 6H2O(I) Use standard heats of formation from Zumdahl 'Chemical Principles' 8th ed. Appendix Four pp A19 - A21 How much heat is evolved when 5.820 moles of C2H6(g) is burned in excess oxygen. Answer to 4 sig figs. 1pts Tries 0/5 Submit Answer How much heat is evolved when 1.136 moles of CO2(g) is produced from the combustion of C2H6(g) Answer to 4 sig figs. 1pts Submit Answer Tries 0/5 How much heat is evolved when 1.203x102 g of C2H6(g) is burned in excess oxygen. Answer to 4 sig figs. 1pts

Answer 1

Equation for the combustion of ethae : 2C,H. (8) +70,(?) —— 400,(8) +6H,0(1) Standard enthalpy change of the reaction is, AH%= MAH' (products) - nAH" (reactants) [(4xAH.com)+6xAH (,0)) kJ/mol 1 -(2xA4/C464)+7%A40.) (14x-393.5 +6x-285.83 +7x0) ) = -3119.62 kJ/mol = -3120 kJ/mol 2X-84.00 kJ/mol Equation: 2C,H. (8) + 702(g) → 400,(8)+6H20(1); A4 - 3120 kJ/mol -3120 kJ Heat released = 5.820 mol C,HX mollz.fo * 2 mol C, H = -9079.2 kJ = -9079 IJ -3120 1J Heat released = 1.136 mol CO, X- 4 mol CH. = -886.08 kJ = -886.1 kJ Heat released = 1.203x102 g x 1 mol CHo -3120 kJ ** 30.078 2 mol CH = -6241kJ