Qhov sib txawv tseem ceeb ntawm molar mass thiab molecular mass yog qhov molar mass muab qhov nruab nrab ntawm cov molecule whereas molecular mass muab qhov loj ntawm ib molecule.
Atoms tuaj yeem koom ua ke hauv ntau qhov sib xyaw ua ke los tsim cov molecules thiab lwm cov tebchaw. Cov qauv molecular muab qhov tseeb piv ntawm atoms; Yog li, peb tuaj yeem sau cov qauv molecular rau cov tebchaw. Cov no yog qhov tseem ceeb hauv kev txiav txim siab molecular masses lossis molar masses. Peb tuaj yeem ua tus qauv molecules nrog lawv cov huab hwm coj. Paub qhov no yog qhov tseem ceeb hauv kev ua haujlwm hauv chav kuaj thaum ntsuas cov tebchaw rau cov tshuaj tiv thaiv.
Molar Mass yog dab tsi?
Peb tuaj yeem hu cov molar mass raws li qhov hnyav molecular thiab. Yog li, nws yog qhov loj ntawm cov khoom rau ib qho nyiaj. SI unit rau molar mass yog g mol-1 Qhov no muab cov nqi ntawm cov atoms/molecule/compounds uas muaj nyob rau hauv ib mole ntawm cov khoom. Hauv lwm lo lus, nws yog qhov loj ntawm Avogadro tus lej ntawm atoms / molecules lossis cov tebchaw.
Nws yog ib qho tseem ceeb rau kev 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 cov masses yog tiag tiag me me raws li ib txwm hnyav tsis (xws li grams los yog kilograms). Yog li ntawd, txhawm rau ua kom tiav qhov sib txawv no thiab ntsuas cov khoom hauv qib macroscopic molar pawg tswv yim yog qhov tseem ceeb.
Daim duab 01: Lub Triatomic Molecule
Lub ntsiab lus ntawm molar mass yog ncaj qha ntsig txog carbon-12 isotope. Qhov loj ntawm ib mole ntawm carbon-12 atoms yog raws nraim 12 grams, uas yog nws molar loj, nws yog raws nraim 12 grams ib mole. Peb tuaj yeem xam cov molar loj ntawm cov molecules uas muaj tib lub atom zoo li O2 los yog N2 los ntawm kev sib npaug ntawm cov atoms los ntawm molar loj ntawm cov atoms. Ntxiv mus, peb tuaj yeem suav cov molar loj ntawm cov tebchaw xws li NaCl lossis CuSO 4 los ntawm kev ntxiv cov atomic masses ntawm txhua lub atom.
Molecular Mass yog dab tsi?
Molecular mass ntawm ib lub compound yog qhov loj ntawm ib lub molecule. Peb tuaj yeem ntsuas qhov no siv atomic mass units (amu). 1 atomic mass unit yog ib feem kaum ntawm qhov loj ntawm C-12 isotope. Thaum peb faib qhov loj ntawm ib lub molecule los ntawm qhov loj ntawm ib feem kaum ntawm qhov loj ntawm C-12 isotope, peb tau txais cov txheeb ze loj. Tsis tas li ntawd, molecular mass txawv raws li cov isotopes uas cov molecule muaj. Thaum xam cov molecular mass, peb yuav tsum xav txog cov isotopic loj.
Qhov txawv ntawm Molar Mass thiab Molecular Mass yog dab tsi?
Molecular mass muab qhov loj ntawm ib lub molecule (cov lej ntawm cov atomic masses nyob rau hauv lub molecule), whereas molar mass muab qhov nruab nrab loj ntawm lub molecule (ntau ntawm Avogadro tus naj npawb ntawm molecules). Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm molar mass thiab molecular mass. Yog li ntawd, molecular loj ntawm ib lub molecule uas muaj cov isotopes hnyav dua tuaj yeem yog ob peb units siab dua molar mass. Txwv tsis pub, tus nqi ntawm molar pawg thiab molecular loj yog tib yam rau ib qho zoo sib xws molecule; tsuas yog cov units txawv. Ib qho tseem ceeb sib txawv ntawm molar mass thiab molecular mass yog qhov chav tsev ntawm molecular mass yog amu, thiab chav tsev ntawm molar loj yog gmol -1
Tsis tas li ntawd, nws yog qhov tseeb los siv cov molecular loj hauv kev suav cov lej ntawm cov molecules ntau dua li siv cov molar mass. Ntxiv mus, nyob rau hauv kev ntsuas, ib qho sib txawv ntawm molar mass thiab molecular mass yog qhov molar mass yog ib qho kev ntsuas, uas peb muab tau rau ib tug atom, molecule los yog compound. Tab sis peb tuaj yeem txiav txim siab qhov loj ntawm molecular nkaus xwb hauv cov molecules. Yog tias nws yog qhov loj ntawm atom, peb siv cov lus sib txawv; atomic mass.
Cov lus qhia hauv qab no nthuav tawm qhov sib txawv ntawm molar mass thiab molecular loj hauv daim ntawv.
Summary – Molar Mass vs Molecular Mass
Tus nqi ntawm molar mass thiab molecular mass yog tib yam rau cov molecule zoo sib xws. Tab sis, rau cov molecule uas muaj cov isotopes hnyav dua, cov molecular loj yog siab dua cov molar mass. Hauv cov ntsiab lus, qhov sib txawv tseem ceeb ntawm molar mass thiab molecular mass yog tias molar mass muab qhov nruab nrab ntawm cov molecule whereas molecular mass muab qhov loj ntawm ib lub molecule.
