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Video: Yuav ua li cas koj xam enthalpy hloov nyob rau hauv chemistry?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Siv cov mis ∆H = m x s x ∆T los daws.
Thaum koj muaj m, qhov loj ntawm koj cov reactants, s, qhov tshwj xeeb kub ntawm koj cov khoom, thiab ∆T, qhov kub thiab txias hloov los ntawm koj cov tshuaj tiv thaiv, koj tau npaj los nrhiav qhov enthalpy ntawm cov tshuaj tiv thaiv. Tsuas yog ntsaws koj qhov tseem ceeb rau hauv cov qauv ∆H = m x s x ∆T thiab muab faib los daws.
Hais txog qhov no, koj ua li cas xam lub zog hloov hauv chemistry?
Txhawm rau xam qhov hloov pauv hluav taws xob rau qhov tshuaj tiv thaiv:
- ntxiv ua ke lub zog ntawm daim ntawv cog lus rau txhua daim ntawv cog lus hauv cov reactants - qhov no yog 'zog hauv'
- ntxiv ua ke lub zog ntawm daim ntawv cog lus rau txhua daim ntawv cog lus hauv cov khoom - qhov no yog 'zog tawm'
- zog hloov = zog hauv - zog tawm.
Ib tug kuj nug, Q MC _firxam_#8710 yog dab tsi; T siv rau? Q = mc∆T . Q = tshav kub zog (Joules, J) m = loj ntawm ib yam khoom (kg) c = tshwj xeeb kub (units J / kg∙K) ∆ yog lub cim txhais tias "kev hloov hauv"
Tib neeg kuj nug, qhov kev hloov pauv hauv enthalpy rau cov tshuaj tiv thaiv tshuaj yog dab tsi?
Rau ib tshuaj tiv thaiv , cov enthalpy ntawm tshuaj tiv thaiv (ΔHrxn) yog qhov sib txawv hauv enthalpy nruab nrab ntawm cov khoom thiab reactants; units ntawm ΔHrxn yog kilojoules ib mole. Rov qab a tshuaj tiv thaiv thim rov qab kos npe ntawm ΔHrxn.
Koj txhais li cas enthalpy?
Enthalpy yog ib qho khoom siv thermodynamic ntawm ib qho system. Nws yog tus lej ntawm lub zog sab hauv ntxiv rau cov khoom ntawm lub siab thiab ntim ntawm lub cev. Nws qhia txog lub peev xwm ua haujlwm tsis yog siv tshuab thiab lub peev xwm tso tawm cua sov. Enthalpy yog denoted li H; tshwj xeeb enthalpy npe h.
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