Formula Weight vs Molecular Luj
Atoms koom thiab ua cov molecules. Atoms tuaj yeem koom nrog ntau qhov sib xyaw ua ke los tsim cov molecules, thiab rau peb txoj kev kawm, peb muaj qee txoj hauv kev los qhia cov molecules. Cov qauv molecular yog ntau hom. Ua ntej tham txog cov mis hnyav los yog qhov hnyav molecular, nws yog ib qho tsim nyog yuav tsum paub tias dab tsi yog cov mis mos molecular thiab cov mis empirical. Cov mis mos molecular yog cov qauv uas qhia tag nrho cov atoms hauv ib lub molecule. Piv txwv li, cov mis mos molecular ntawm qabzib yog C6H12O6 Yog li cov piam thaj molecule muaj rau. carbon thiab oxygen atoms thiab kaum ob hydrogen atoms. Empirical formula qhia qhov yooj yim piv ntawm tus naj npawb ntawm atoms hauv ib lub molecule. Piv txwv li, CH2O yog cov qauv ntawm cov piam thaj. Rau qee cov molecules zoo li dej (H2O), empirical formula thiab cov mis molecular yog tib yam.
Formula Weight yog dab tsi?
Formula hnyav yog qhov sib npaug ntawm qhov hnyav ntawm tag nrho cov atoms nyob rau hauv ib tug empirical formula ntawm ib tug molecule. Txij li cov mis empirical qhia tsuas yog hom atoms nyob rau hauv lub molecule thiab lawv cov piv txwv yooj yim tshaj plaws, nws tsis muab qhov tseeb mis ntawm lub molecule. Yog li los ntawm cov mis hnyav qhov tseeb qhov hnyav ntawm cov molecule tsis muab. Txawm li cas los xij, nyob rau hauv cov polymers thiab loj ionic tebchaw, empirical mis yog muab los qhia cov molecule. Nyob rau hauv tas li ntawd, mis nyuj hnyav yog ib qho tseem ceeb.
Rau cov molecules zoo li dej, mis hnyav thiab molecular hnyav yuav zoo sib xws vim lawv cov mis empirical thiab cov mis molecular yog tib yam.
Molecular Luj yog dab tsi?
Molecular hnyav yog cov khoom hnyav ntawm tag nrho cov atoms hauv ib lub molecule. Chav tsev SI ntawm qhov hnyav molecular yog g mol-1 Qhov no muab tus nqi ntawm cov atoms / molecules / compounds tam sim no 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. Txawm li cas los xij, nws yog ib qho nyuaj rau kev ntsuas lawv raws li ib tus neeg hais, vim lawv cov huab hwm coj tsawg heev raws li qhov ntsuas qhov hnyav (grams lossis kilograms). Yog li ntawd, txhawm rau ua kom tiav qhov sib txawv no thiab ntsuas cov khoom hauv qib macroscopic, molar mass tswvyim yog qhov tseem ceeb. 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, uas yog nws molar loj yog raws nraim 12 grams ib mole.
Molecular hnyav ntawm molecules uas muaj tib lub atoms xws li O2 los yog N2 yog xam los ntawm kev muab cov lej ntawm cov atoms los ntawm cov atomic hnyav ntawm cov atoms. Molecular hnyav ntawm cov tebchaw xws li NaCl los yog CuSO 4 yog xam los ntawm kev ntxiv cov atomic luj ntawm txhua atom.
Qhov txawv ntawm Formula Weight thiab Molecular Luj yog dab tsi?
