Video: Dab tsi yog units rau Gibbs dawb zog?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Chemists ib txwm ntsuas lub zog (ob leeg enthalpy thiab Gibbs dawb zog) hauv kJ ua mol-1 ( kilojoules per mole) tab sis ntsuas entropy hauv J K -1 mol-1 ( joules ua rau kelvin rau mole). Yog li nws yog ib qho tsim nyog los hloov cov chav nyob - feem ntau los ntawm kev faib cov txiaj ntsig entropy los ntawm 1000 kom lawv ntsuas hauv kJ K-1 mol-1.
Tsis tas li ntawd, dab tsi yog units ntawm enthalpy?
Cov SI unit rau qhov tshwj xeeb enthalpy yog joule ib kilogram. Nws tuaj yeem hais tawm hauv lwm qhov tshwj xeeb los ntawm h = u + pv, qhov twg u yog lub zog tshwj xeeb sab hauv, p yog qhov siab, thiab v yog qhov ntim tshwj xeeb, uas yog sib npaug rau 1ρ, qhov twg ρ yog qhov ceev.
Ib sab saum toj no, koj yuav suav Gibbs dawb zog li cas? Cov Gibbs free zog ntawm ib lub sij hawm nyob rau hauv lub sij hawm yog txhais raws li lub enthalpy ntawm lub system rho tawm cov khoom ntawm kub lub sij hawm lub entropy ntawm lub system. Cov Gibbs free zog ntawm lub system yog lub xeev muaj nuj nqi vim hais tias nws yog txhais raws li cov ntsiab lus ntawm cov thermodynamic zog uas yog lub xeev functions.
Hauv qhov no, Gibbs puas muaj lub zog pub dawb?
Gibbs dawb zog yog sawv cev siv lub cim Gstart ntawv, G, ntawv kawg thiab feem ntau muaj units ntawm mol-rxnkJ?pib feem, pib ntawv, k, J, cov ntawv kawg, faib los ntawm, pib ntawv, m, o, l, negative, r, x, n, kawg ntawv, kawg feem.
Delta G units yog dab tsi?
Txij li thaum entropy muaj units ntawm J K-1 mol-1, T x ∆S muaj units ntawm J mol-1 thiab yog ib qho kev ntsuas ntawm lub zog. Peb hu lub sij hawm '–T∆Stag nrho' Gibbs dawb zog tom qab American chemist Josiah Willard Gibbs. Nws muab lub cim ∆ G yog li ntawd. ∆ G = ∆H – T∆Sqhov system.
Pom zoo:
Yuav ua li cas koj hloov cov units me mus rau cov units loj?
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