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C 6 h 14 l 192 o 2 g 6co 2 g 7h 2 og 4141 kj 2c 6 h

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C 6 H 14 (l) + 19/2 O 2 (g) 6CO 2 (g) + 7H 2 O(g) + 4141 kJ 2C 6 H 14 (l) + 19O 2 (g) 12CO 2 (g) + 14H 2 O(g) + 8282 kJ 7. a. Heat absorbed by water = 3.3 x 10 4 J b. Heat released by fuel = -3.3 x 10 4 J c. The assumption made is that all heat released by the fuel is absorbed by the water, and no heat is lost to the container or other surroundings. In reality, more heat is released by the fuel than is absorbed by the water. Some of the released heat is absorbed by the container, etc. 8. a. 70% isooctane: 30% heptane b. Gas with an octane number of 87 would burn more smoothly than gas with an octane number of 70. The higher the octane number, the higher the antiknock characteristics. This is because a higher octane rating means there is a larger percentage of branched alkanes to straight-chain alkanes within the fuel. Branched alkanes burn more slowly, and thus, more evenly than their straight-chain counterparts. Straight-chain alkanes burn rapidly and, as
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a result, engines may “ping” or “knock” when burning fuels containing high amounts of straight-chain alkanes. 9. Tetraethyl Lead was added prior to the mid-1970s. Its use was banned because lead was released into the atmosphere—leading to an array of environmental and health problems. Methyl tertiary-butyl ether (MTBE) was introduced in the late 1970s and used until high levels of MTBE were found in groundwater and drinking water supplies (in the late 1990s). Even when present at levels low enough to be considered “safe,” this contaminant imparts water with an unpleasant taste and odor. 10. Energy-dense Easily stored and transported Renewable/Limitless Inexpensive Safe (to health and to the environment)
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