Video: Yuav ua li cas koj xam enthalpy ntawm ib tug system?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv cov cim, cov enthalpy , H, sib npaug cov sum ntawm lub zog sab hauv, E, thiab cov khoom ntawm lub siab, P, thiab ntim, V, qhov system : H = E + PV. Raws li txoj cai ntawm kev txuag hluav taws xob, kev hloov hauv lub zog sab hauv yog sib npaug kub pauv mus rau, tsawg dua cov haujlwm ua los ntawm, lub qhov system.
Hauv qhov no, dab tsi yog qhov enthalpy ntawm lub system?
Enthalpy yog ib tug thermodynamic khoom ntawm a qhov system . Nws yog tus lej ntawm lub zog sab hauv ntxiv rau cov khoom ntawm lub siab thiab ntim ntawm lub qhov system . Nws qhia txog lub peev xwm los ua cov haujlwm tsis siv tshuab thiab lub peev xwm tshem tawm cov cua sov. Enthalpy yog denoted li H; tshwj xeeb enthalpy npe h.
Tsis tas li ntawd, dab tsi yog enthalpy ntawm qhov system li cas nws cuam tshuam nrog lub zog sab hauv? Qhov kev hloov hauv lub zog sab hauv ntawm a qhov system yog qhov sum ntawm kub hloov mus thiab ua haujlwm tiav. Thaum lub siab tsis tu ncua, kub flow (q) thiab lub zog sab hauv (E) yog ntsig txog mus rau system'senthalpy (H). Cov kub ntws yog sib npaug rau qhov kev hloov hauv lub lub zog sab hauv ntawm qhov system ntxiv rau PV ua haujlwm.
Kuj kom paub yog, koj ua li cas xam cov enthalpy ntawm cov tshuaj tiv thaiv?
Siv cov qauv ∆H = m x s x ∆T tosolve. Thaum koj muaj m, qhov loj ntawm koj cov reactants, s, tshwj xeeb kub ntawm koj cov khoom, thiab ∆T, qhov kub thiab txias hloov ntawm koj cov khoom. tshuaj tiv thaiv , koj npaj mus nrhiav tus enthalpy ntawm tshuaj tiv thaiv . Tsuas ntsaws koj qhov tseem ceeb rau hauv qauv ∆H = m x s x ∆T thiab multiply tosolve.
Dab tsi yog enthalpy hauv cov ntsiab lus yooj yim?
Enthalpy . Thaum cov khoom hloov pauv ntawm qhov tsis tu ncua, enthalpy qhia ntau npaum li cas kub thiab ua hauj lwm tau ntxiv los yog tshem tawm ntawm cov khoom. Enthalpy zoo ib yam li lub zog, tab sis tsis zoo ib yam. Thaum cov khoom loj hlob los yog qis, lub zog siv los yog tso tawm.
Pom zoo:
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