November 30, 2022, 12:52:54 PM
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Topic: Enthalpy of Vaporization and specific heat capacity  (Read 636 times)

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Offline Loona

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Enthalpy of Vaporization and specific heat capacity
« on: April 16, 2022, 06:27:45 AM »
For a science project, I need to do a model calculation on how much energy was needed to heat a mixture of four organothiophosphates (the amount as well as CAS of each substance is known) until it exploded. (It is known that the substances exploded after being stored at a too high temperature). The problem is that I am not able to find the specific heat capacities of the substances (for reference, CAS 756-80-9, 5930-72-3, 5930-73-4, 5930-71-2) on websites such as the NIST Chemistry WebBook or the nih.gov WebWiser (currently down). However, I could find the Enthalpy of vaporization (the formation enthalpy, but I feel like that would be even further from what I need) of quite similar substances.

Now, is there a way to calculate the specific heat capacity based on the enthalpy of vaporization (I do have the boiling point of most substances, however at extremely low pressure (200 Pa)) or can it help me in another way?

Also, do the "thio-"s (the Sulfur replacing oxygen) significantly influence the heat capacity or can I ignore them for now, as maybe the capacities of the respective acid without Sulfur has been determined?

Thanks in advance!

Offline Orcio_87

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Re: Enthalpy of Vaporization and specific heat capacity
« Reply #1 on: April 16, 2022, 03:43:05 PM »
Quote
is there a way to calculate the specific heat capacity based on the enthalpy of vaporization
I think that they are not related:

https://en.wikipedia.org/wiki/Water_(data_page)
https://en.wikipedia.org/wiki/Methanol_(data_page)
https://en.wikipedia.org/wiki/Hexane_(data_page)

Ratio of specific heat capacity / enthalpy of vaporisation ranges between 1,60 - 2,16.

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