Video: 0 Delta G txhais li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ib qho tshuaj tiv thaiv yog xav txog tus kheej thaum nws tuaj yeem cuam tshuam nrog lwm lub ntsiab lus ntawm nws tus kheej, yam tsis muaj kev pab los ntawm lub catalyst. Delta G yog cim rau spontaneity, thiab muaj ob yam uas yuav cuam tshuam rau nws, enthalpy thiab entropy. Thaum twg delta G < 0 - Nws yog ib qho kev tshwm sim spontaneous. Thaum twg delta G = 0 - Nws nyob ntawm equilibrium.
Ib yam li ntawd, tib neeg nug, nws txhais li cas yog tias Delta G yog 0?
Cov tshuaj tiv thaiv tsis zoo muaj Delta G cov txiaj ntsig zoo (tseem hu ua endergonic cov tshuaj tiv thaiv). Thaum twg tus Delta G rau ib qho tshuaj tiv thaiv yog xoom, cov tshuaj tiv thaiv yog hais tias nyob rau hauv equilibrium. Equilibrium ua TSIS TAU txhais tau tias sib npaug concentration. Yog tus Delta G yog xoom, tsis muaj qhov hloov pauv hauv A thiab B, vim tias qhov system nyob ntawm qhov sib npaug.
Qhov thib ob, yuav ua li cas thaum Gibbs dawb zog yog xoom? Gibbs free zog yog ib qho kev ntsuas ntawm ntau npaum li cas "muaj peev xwm" cov tshuaj tiv thaiv tau tso tseg ua net "ib yam dab tsi." Yog li ntawd yog hais tias tus lub zog dawb yog xoom , tom qab ntawd cov tshuaj tiv thaiv nyob ntawm qhov sib npaug, tsis muaj kev ua 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.
Hauv qhov no, 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.
Delta G qhia peb li cas?
Lub zog dawb hloov pauv ntawm cov tshuaj tiv thaiv ( delta G ) tau qhia rau peb seb puas muaj qhov tshwm sim tshwm sim spontaneously. Cov tshuaj tiv thaiv uas tshwm sim spontaneously muaj qhov tsis zoo delta G tus nqi, thiab cov tshuaj tiv thaiv zoo li no hu ua exergonic. Thaum lub kaw lus nyob rau ntawm qhov sib npaug uas tsis muaj qhov hloov pauv tshwm sim, ces delta G yog zero.
Pom zoo:
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