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Ethanol - Dehydration.

Ethanol can be dehydrated to make ethene.
This reaction is the reverse of the hydration of ethene.

Ethanol gas (vapour) is passed over a hot aluminium oxide catalyst.

ethanol            ethene   +    water
C₂H₅OH_(l)        C₂H_4(g)   +   H₂O_(l)

Ethene can also be made by cracking hydrocarbons.

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