Qhov sib txawv tseem ceeb ntawm qhov tseeb qhov hnyav thiab qhov hnyav molecular yog qhov tseeb qhov hnyav yog qhov nruab nrab ntawm cov atoms ntawm ib lub ntsiab ntsuas hauv atomic mass unit, whereas molecular hnyav yog qhov sib sau ntawm qhov hnyav ntawm tag nrho cov atoms hauv molecule..
Qhov hnyav thiab molecular hnyav yog cov ntsiab lus tseem ceeb ntawm qib atomic. Peb tuaj yeem piav qhia cov ntsiab lus no raws li kev siv tshuaj lom neeg, uas peb xav tau kev suav hais txog lub cev lub cev ntawm atoms.
Dab tsi yog pawg ntseeg?
Cov huab hwm coj tseeb tuaj yeem txhais tau tias yog qhov nruab nrab loj ntawm cov atoms ntawm cov khoom ntsuas hauv ib chav atomic mass. Nws tseem hu ua qhov hnyav nruab nrab molecular hnyav. Qhov hnyav nruab nrab molecular hnyav yog qhov hnyav ntawm cov molecules hauv cov qauv polymer. Nws yog lwm txoj hauv kev los txiav txim siab qhov molecular loj ntawm cov polymer. Nws muab qhov nruab nrab ntawm cov molecular masses ntawm tus kheej macromolecules hauv cov qauv polymer. Peb tuaj yeem pom qhov ntsuas no siv qhov sib npaug hauv qab no:
Mw=∑ NiMi2 / ∑ NiMi
Qhov twg Mw yog qhov hnyav nruab nrab molecular hnyav, Ni yog tus naj npawb ntawm molecules ntawm molecular mass Mi. Peb tuaj yeem txiav txim siab qhov ntsuas no siv lub teeb pom kev zoo li qub, tawg lub kaum sab xis me me, xoo hluav taws xob tawg, thiab qhov nrawm nrawm. Qhov tseem ceeb tshaj, qhov hnyav nruab nrab molecular hnyav ib txwm ntau dua qhov hnyav nruab nrab molecular hnyav vim tias cov molecules loj hauv cov qauv hnyav dua li cov molecules me.
Molecular Luj yog dab tsi?
Molecular hnyav tuaj yeem txhais tau tias yog qhov sib sau ntawm qhov hnyav ntawm tag nrho cov atoms hauv ib lub molecule. SI unit ntawm qhov ntsuas no yog gmol-1. Qhov hnyav molecular yog tus nqi ntawm atoms / molecules / compounds tam sim no nyob rau hauv ib mole ntawm cov khoom. Qhov no txhais tau hais tias nws yog qhov loj ntawm Avogadro tus naj npawb ntawm atoms / molecules los yog compounds.
Nws yog ib qho tseem ceeb los ntsuas qhov hnyav ntawm atoms thiab molecules hauv qhov ua tau zoo. Tab sis nws yog ib qho nyuaj rau hnyav lawv raws li ib tug neeg hais vim hais tias lawv pawg yog heev me me raws li ib txwm hnyav tsis (grams los yog kilograms). Yog li ntawd, txhawm rau ua kom tiav qhov sib txawv no thiab ntsuas cov khoom ntawm qib macroscopic, lub tswv yim molar mass yog qhov tseem ceeb heev.
Daim duab 01: Sib cais cov protein los ntawm Molecular Nyhav
Lub ntsiab lus ntawm qhov hnyav molecular yog ncaj qha ntsig txog carbon-12 isotope. Qhov loj ntawm ib mole ntawm carbon 12 atoms yog raws nraim 12 grams, yog li nws molar loj yog raws nraim 12 grams ib mole. Ntxiv mus, peb tuaj yeem xam qhov hnyav ntawm cov molecules uas muaj tib lub atoms xws li O2 lossis N2 los ntawm kev muab cov lej ntawm cov atoms los ntawm qhov hnyav ntawm cov atoms. Txawm li cas los xij, qhov hnyav molecular ntawm cov tebchaw xws li NaCl lossis CuSO4 yog xam los ntawm kev ntxiv cov atomic hnyav ntawm txhua lub atom.
Dab tsi yog qhov txawv ntawm Cov Loj thiab Molecular Luj?
Qhov hnyav thiab molecular hnyav yog cov ntsiab lus tseem ceeb ntawm qib atomic. Peb tuaj yeem piav qhia cov ntsiab lus no nyob rau hauv chemistry dav dav, qhov twg peb xav tau kev xam txog lub cev lub cev ntawm atoms. Qhov sib txawv tseem ceeb ntawm qhov tseeb qhov hnyav thiab qhov hnyav molecular yog qhov tseeb qhov hnyav yog qhov nruab nrab ntawm cov atoms ntawm cov khoom ntsuas hauv atomic mass unit, whereas molecular hnyav yog qhov sib sau ntawm qhov hnyav ntawm tag nrho cov atoms hauv ib lub molecule.
Summary – Exact Mass vs Molecular Luj
Cov huab hwm coj tseeb tuaj yeem txhais tau tias yog qhov nruab nrab loj ntawm cov atoms ntawm cov khoom ntsuas hauv ib chav atomic mass. Molecular hnyav tuaj yeem txhais tau tias yog qhov sib sau ntawm qhov hnyav ntawm tag nrho cov atoms hauv ib lub molecule. Qhov sib txawv tseem ceeb ntawm qhov tseeb qhov hnyav thiab qhov hnyav molecular yog qhov tseeb qhov hnyav yog qhov nruab nrab ntawm cov atoms ntawm cov khoom ntsuas hauv atomic mass unit, whereas molecular hnyav yog qhov sib sau ntawm qhov hnyav ntawm tag nrho cov atoms hauv ib lub molecule.
