One method for making ethanol,C2H5OH,involves the gas-phase hydration of ethylene,C2H4:
Estimate ΔH for this reaction from the given average bond dissociation energies,D. 
Definitions:
Tender Of Performance
Tender of Performance refers to an offer by one party to perform their obligations under a contract, demonstrating readiness and willingness to fulfill the contract terms.
Bilateral Contract
A contract type involving two parties where each promises to perform an act in exchange for the other party's act.
Perfect Tender Rule
A principle in sales law that allows buyers to reject goods if they fail to meet every aspect of the contractual terms.
Material Breach
A significant violation or failure to perform one's duties under a contract, justifying termination by the other party.
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