Lecture 11

Lecture 11 - CHM 11500 Lecture 11 10-2-08 1 Energy Content...

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1 CHM 11500 Lecture 11 10-2-08
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2 Energy Content There is a 25% loss in energy when using a mix of 85% ethanol and 15% gasoline as compared to 100% gasoline. Why? Ethanol: CH 3 CH 2 OH(l) + 3 O 2 (g) 2 CO 2 (g) + 3 H 2 O(g) ΔH = 30 kJ/g Octane, a good approximation to gasoline: C 8 H 18 (l) + 16½ O 2 (g) 8 CO 2 (g) + 9 H 2 O(g) ΔH = 48 kJ/g The covalent bonds are stronger, on average, in ethanol than in octane. Today we will see why that effects the energy available. (Density also plays a part - there are more grams of ethanol in a liter of ethanol than grams of octane in a liter of octane.)
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3 Electrostatic attraction and repulsion in covalent compounds H 1s orbital H 2 covalent bond
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4 Energy of H + H Electrostatic repulsion Little interaction Equilibrium position Electrostatic attraction See page 439 in your text
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5 Parameters of a H 2 bond Bond Energy: Energy required to overcome the electrostatic attraction of a bond and separate its components as isolated atoms. Bond Length: Distance between nuclei at which potential energy is lowest.
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6 CPS Question #1 - Buddy Which statement is correct for the hydrogen molecule (H 2 ) at its optimal bond length? A. The total strength of the electron-nuclei
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Lecture 11 - CHM 11500 Lecture 11 10-2-08 1 Energy Content...

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