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At high temperatures, alkanes can undergo dehydrogenation

Chapter 9, Problem 9.48

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QUESTION:

At high temperatures, alkanes can undergo dehydrogenation to produce alkenes. For example: C C H H H H H H C C H H H H Ethane Ethylene H2 Hydrogen gas 750 C + This reaction is used industrially to prepare ethylene while simultaneously serving as a source of hydrogen gas. Explain why dehydrogenation only works at high temperatures.

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QUESTION:

At high temperatures, alkanes can undergo dehydrogenation to produce alkenes. For example: C C H H H H H H C C H H H H Ethane Ethylene H2 Hydrogen gas 750 C + This reaction is used industrially to prepare ethylene while simultaneously serving as a source of hydrogen gas. Explain why dehydrogenation only works at high temperatures.

ANSWER:

Step 1 of 3

Whether a reaction occurs spontaneously is dependent on the sign of G, which is determined by the following equation.

          G = H - TS

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