Combustion of gas PHYSICAL CHEMISTRY QUESTION [helppppp] PART TWO?

Question

The combustion of gasoline releases tremendous amounts of heat. It is the work done on the piston that is the main goal of the reaction, so systems are developed to remove the excess heat produced, since only about 30% of the energy from gasoline is used as work.

2 C8H18 (l) + 25 O2 (g) → 16 CO2 (g) + 18 H2O (g) H = –10110 kJ

C)Let's say that the temperature at which your engine parts begin to melt is 3500 °C. Can your engine handle the temperature you calculated in part b.? Explain your answer.

D)Your engine has an elaborate cooling system that allows it to maintain a reasonable temperature by transferring heat to a coolant. One coolant option may be water. Knowing that water has a high specific heat, freezes at 0 °C, and boils at 100 °C, discuss the pros and cons of using water as your coolant.

Answer 1

C) Let's say that the temperature at which your engine parts begin to melt is 3500 °C. Can your engine handle the temperature you calculated in part b.? Explain your answer.

The engine will start to melt 3500C. Because burning 5.5 gallons of gasoline would heat the engine to over 7000C, no the engine will not handle the temperature because it would melt.

D) Your engine has an elaborate cooling system that allows it to maintain a reasonable temperature by transferring heat to a coolant. One coolant option may be water. Knowing that water has a high specific heat, freezes at 0 °C, and boils at 100 °C, discuss the pros and cons of using water as your coolant.

A high specific heat is an advantage because it would take less water to transfer the heat than other coolants with lower specific heat. Boiling at 100C is acceptable because the air temperature is usually far lower than that allowing the heat to efficiently be transmitted to air even when it is hot. Freezing at 0C is a problem because temperatures below that are pretty common and freezing of the coolant would damage the engine.

Answer 2

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Answer 3

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