Lecture19_upload - Reminder There will be no lecture on 03...

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Reminder : There will be no lecture on 03 / 28 (Monday). Instead , there will be lecture on 04 / 01 (Friday). (for real… it’s no April fools’) I won’t be here for office this Friday.

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Determine the standard reaction enthalpy for the  formation of 2 moles of C from A and B: 4A + 3B F  2C if the following reactions are known: 2A + D F  C + ±      D H o = +200 kJ 2D F  3B + 2±        D H o = +100 kJ B.  300 kJ C.  400 kJ D.  500 kJ A.  100 kJ

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Alcohol vs. Gasoline C2H5OH (l) + 3 O2 (g)  2 CO2 (g) + 3 H2O (g) C8H18 (l) + 12.5 O2 (g)  8 CO2 (g) + 9 H2O (g) Ethanol Octane

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O2 ( g ) ∆H0f = 0 kJ/mol H2O( g ) ∆H0f = -241.8 kJ/mol CO2( g ) ∆H0f = -393.5 kJ/mol Other data needed: Ethanol Octane Density: 0.785 g/mL 0.699 g/mL ∆H0f -277 kJ/mol -250.1 kJ/mol C2H5OH (l) + 3 O2 (g)  2 CO2 (g) + 3 H2O (g) C8H18 (l) + 12.5 O2 (g)  8 CO2 (g) + 9 H2O (g)
Calculate H 0rxn for the combustion of ethanol and octane. Which produces more energy for a given volume? (e.g. 1 L ?) A. Ethanol B. Octane Alcohol vs. Gasoline

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A
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Lecture19_upload - Reminder There will be no lecture on 03...

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