CHEM 1050 Lecture Notes - Lecture 8: Covalent Bond, Joule, Lattice Energy
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1 Feb 2016
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N is the number of moles of gas in products minus reactants. Note: t is the same if in kelvins or celcius. We know that energy comes out (released) when fuel (or food) is combusted. (exothermic) Called fuel value in grams not moles since we"re talking about mixtures not pure molecules i. e. gasoline. How many grams are in each mole of octane. Therefore the fuel value of octane is 47. 5 kj/g c8h8. 2c57h110o6 + 163o2 114co2 + 110h2o(l) h = -75 520 kj (lots of energy) Stability of molecule is related to the strength of covalent bonds it has. Note: strength is the same energy value you need to break that covalent bond. The h to break a bond in a mole of stuff (gaseous molecules) Ch4 ch3 + h h = 435 kj. Ch3 ch2 + h h = 464 kj. Ch2 ch + h h = 422 kj. Ch c + h h = 339 kj.
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