Video: Yuav ua li cas thaum G0?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Thaum Δ G < 0 Delta ext G < 0 Δ G < 0 delta, pib ntawv, G , kawg ntawv, tsawg dua, 0 , cov txheej txheem yog exergonic thiab yuav mus spontaneously nyob rau hauv cov kev taw qhia pem hauv ntej kom tsim ntau yam khoom. Qhov ntawd txhais tau hais tias qhov concentrations ntawm cov reactants thiab cov khoom yuav nyob twj ywm nyob rau hauv equilibrium.
Cov lus nug tseem yog, yuav ua li cas thaum Delta G yog xoom?
Cov tshuaj tiv thaiv tsis zoo muaj Delta G cov txiaj ntsig zoo (tseem hu ua endergonic cov tshuaj tiv thaiv). Thaum lub Delta G rau cov tshuaj tiv thaiv yog xoom , ib qho tshuaj tiv thaiv yog hais tias nyob rau hauv equilibrium. Equilibrium TSIS txhais hais tias sib npaug sib npaug. Yog tias Delta G yog xoom , tsis muaj qhov hloov pauv hauv A thiab B, vim tias qhov system nyob ntawm qhov sib npaug.
Ib yam li ntawd, yuav ua li cas yog Gibbs dawb lub zog tsis zoo? Gibbs free zog yog ib qho muab tau los uas sib xyaw ua ke ntawm ob lub zog tsav tsheb loj hauv cov txheej txheem tshuaj lom neeg thiab lub cev, xws li kev hloov pauv enthalpy thiab hloov pauv entropy. Yog tus lub zog dawb yog qhov tsis zoo , peb tab tom saib kev hloov pauv hauv enthalpy thiab entropy uas nyiam cov txheej txheem thiab nws tshwm sim tus kheej.
Ib yam li ntawd, puas yog qhov tshwm sim tshwm sim thaum Delta G yog 0?
Delta G sib npaug 0 . Thaum twg delta G yog positive, the tshuaj tiv thaiv tsis yog tus kheej . Thaum nws tsis zoo, nws yog tus kheej.
Vim li cas Gibbs pub dawb zog 0 ntawm qhov sib npaug?
Gibbs free zog yog ib qho kev ntsuas ntawm ntau npaum li cas "muaj peev xwm" cov tshuaj tiv thaiv tau tawm mus ua ib qho "ib yam dab tsi." Yog li ntawd yog hais tias tus dawb zog yog xoom, ces cov tshuaj tiv thaiv yog nyob rau kev sib npaug , tsis muaj haujlwm ntxiv tuaj yeem ua tiav. Tej zaum nws yuav yooj yim dua los pom qhov no siv lwm hom ntawv ntawm tus Gibbs free zog , xws li ΔG = -TΔS.
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