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Ethylene (C2H4) is an important petroleum derivative that can be used as a precursor to a...

Ethylene (C2H4) is an important petroleum derivative that can be used as a precursor to a wide array of materials such as polymers. It can be prepared by the dehydrogenation of ethane (C2H6):

?2?6(?) → ?2?4(?) + ?2(?)

Before an ethylene production plant can be built, it is important to know if the reaction absorbs or releases heat.

a. Determine ∆???? for the reaction above using the following reactions below of known reaction enthalpy.

b. Suppose that the dehydrogenation of ethane is carried out in a big steel vessel, and it is beneficial to keep the temperature of the vessel constant. Using the result from (a), do you need to ADD or REMOVE heat from the reaction vessel to keep its temperature constant? Why?

∆???? ( ?? ???)

2?2?6(?) + 7?2(?) → 4??2(?) + 6?2?(?) = -3119.4

?2?4(?) + 3?2(?) → 2??2(?) + 2?2?(?) = -1410.9

2?2(?) + ?2(?) → 2?2?(?) = -571.7

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