Based on the figure above,the boiling point of diethyl ether under an external pressure of 
is ________ °C.
Definitions:
Binding Promise
A pledge or commitment that legally compels the promisor to fulfill the terms of the promise.
Illusory Promise
An agreement that fails to bind the promisor since it lacks the definiteness or the possibility of performance, making it unenforceable.
Pre-existing Duty Rule
A legal principle stating that a party's promise to perform a duty that is already owed under a contract does not constitute valid consideration for a new agreement.
Synthetic Fuel Oil
A liquid fuel produced from coal, natural gas, or biomass through chemical processes rather than by natural geological processes.
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