10.15 - Combusion of Butane C4H10 FW 58.12 g/mol Combust...

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1 Combusion of Butane • C 4 H 10 • FW 58.12 g/mol • Combust 1.000 g, get 49.51 kJ heat Δ H c = -2878 kJ/mol But Wait… • There are two isomers of butane: n -butane isobutane • Which is more the more stable position of atoms? (i.e., compare potential energy) Combusion of Isobutane • C 4 H 10 • FW 58.12 g/mol • Combust 1.000 g, get 49.36 kJ heat Δ H c = -2869 kJ/mol
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Combustion of Butane • C 4 H 10 + ___ O 2 --> ___ CO 2 + ___ H 2 O • Same oxygen, same products • Compare relative starting points by “how far one must travel to get to the same end point” • C 4 H 10 • FW 58.12 g/mol • Combust 1.000 g, get 49.36 kJ heat Δ H c = -2869 kJ/mol • 1.000 g propane (C 3 H 8 , FW 44.10), get 50.32 kJ of heat Δ H c = -2219 kJ/mol Combusion of Isobutane Which is more stable arrangement of atoms? Bogus Question • Can’t compare stability of butane and propane, because they are not different arrangements of the same atoms • Products of combustion are different
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10.15 - Combusion of Butane C4H10 FW 58.12 g/mol Combust...

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