Video: Cov kua methanol lossis ethanol twg muaj qhov vapor siab dua ntawm chav tsev kub?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Methanol muaj qhov loj dua vapor siab ntawm chav tsev kub vim nws muaj qis molecular hnyav thaum piv nrog ethanol , uas implies nws muaj qaug zog intermolecular zog.
Ib yam li ntawd, tej zaum koj yuav nug, vim li cas methanol thiaj li muaj vapor siab dua li ethanol?
Teb thiab piav qhia: Ob leeg methanol thiab ethanol muaj hydrogen bonds raws li lawv lub zog tseem ceeb. Txawm li cas los xij, ethanol ua hnyav dua muaj muaj zog London-dispersion rog vim hais tias ntawm nws cov boiling point yog siab dua . Yog vim li cas methanol molecules evaporate yooj yim thiab muaj vapor siab dua.
Kuj Paub, qhov kev sib raug zoo ntawm qhov kub ntawm cov kua thiab lub vapor siab ntawm cov kua yog dab tsi? Cov vapor siab ntawm a ua kua nws txawv nrog nws kub , raws li cov duab hauv qab no qhia rau dej. Cov kab ntawm daim duab qhia qhov kub kub rau dej. Raws li cov kub ntawm cov kua los yog khoom nce nws vapor siab kuj nce. Hloov pauv, vapor siab txos li cov kub txo.
Kuj tseem yuav paub, koj puas xav kom lub vapor siab ntawm methanol me dua lossis loj dua li cov dej?
Vim methanol muaj zog IMFs dua dej , nws lub zog pib qis dua, thiab a ntau dua ib feem ntawm nws cov molecules tuaj yeem kov yeej lawv cov IMFs. Yog li ntawd, nyob rau ntawm qhov kub thiab txias, methanol yuav muaj ntau molecules nyob rau hauv cov pa roj theem thiab siab dua vapor siab tshaj dej.
Yuav ua li cas koj xam vapor siab ntawm qhov kub thiab txias?
Hauv chemistry, vapor siab yog cov siab uas yog exerted rau ntawm phab ntsa ntawm lub thawv kaw thaum ib yam khoom nyob rau hauv nws evaporates (hloov mus rau ib tug roj). Yuav nrhiav tau vapor siab ntawm ib qho muab kub , siv Clausius-Clapeyron kev sib npaug : ln(P1/P2) = (ΔHvap ua/R)((1/T2) - (1/T1)).
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