Qhov sib txawv tseem ceeb ntawm mole feem thiab qhov hnyav feem pua yog qhov feem pua mole muab cov khoom sib xyaw ntawm cov tshuaj hauv kev sib xyaw los ntawm moles thaum qhov hnyav feem pua muab cov muaj pes tsawg leeg los ntawm pawg.
Mole feem thiab qhov hnyav feem pua lossis pawg pawg yog ob txoj hauv kev sib txawv ntawm kev qhia txog kev sib xyaw ntawm cov khoom sib xyaw. Nyob ntawd, ob qhov tseem ceeb no tsis sib npaug, tab sis txoj kev txiav txim siab zoo ib yam vim tias, nyob rau hauv ob qho xwm txheej, peb yuav tsum faib cov mole tus lej lossis qhov loj ntawm qhov xav tau los ntawm tag nrho mole tooj lossis tag nrho cov khoom sib xyaw kom tau txais tus nqi.. Feem ntau, qhov hnyav feem pua yog qhia raws li tus nqi feem pua.
Dab tsi yog Mole Fraction?
Mole feem ntawm ib qho khoom sib xyaw hauv qhov sib tov yog tus nqi muab los ntawm kev faib cov lej ntawm cov khoom sib xyaw los ntawm tag nrho cov mole naj npawb ntawm cov sib tov. Tus nqi muab ntau npaum li cas ntawm ib qho kev tivthaiv yog tam sim no nyob rau hauv ib qho kev sib tov (qhov muaj pes tsawg leeg ntawm cov khoom siv los ntawm moles). Feem ntau, peb muab tus nqi no ua ib feem lossis hauv ib lossis ob qhov chaw lej. Vim nws yog ib qho piv, cov mole feem yog unitless.
Peb tuaj yeem txiav txim siab qhov feem ntawm mole ntawm txhua qhov sib xyaw ua ke, thiab los ntawm kev ntxiv cov feem tseem ceeb no ua ke, peb tau txais 1. Cia peb xav txog qhov piv txwv; Yog tias muaj kev sib xyaw uas muaj 2 moles ntawm sodium chloride thiab 5 moles dej hauv cov ntsev, tag nrho cov moles sib npaug 2 + 5=7. Ntawm no, yog tias peb yuav tsum xam cov mole feem ntawm sodium chloride, Mole feem ntawm sodium chloride=moles ntawm sodium chloride / tag nrho moles hauv qhov sib tov
=2/(2+5)
=2/7
=0.28
Daim duab 01: Sodium Chloride Mole Fraction hauv ntsev dej
Puas Pua Yog Dab Tsi?
Nyhav feem pua lossis qhov hnyav feem pua yog qhov feem pua ntawm qhov hnyav ntawm cov khoom sib xyaw. Peb hu nws qhov loj feem thiab. Tsis tas li ntawd, lo lus no piav qhia txog qhov sib piv ntawm qhov loj ntawm qhov xav tau thiab tag nrho qhov loj ntawm qhov sib xyaw ua ke los ntawm 100 kom tau txais tus nqi feem pua. Cov mis rau kev txiav txim siab no yog raws li nram no:
Nyhav feem pua =(ntau ntawm cov khoom / tag nrho cov khoom sib xyaw)100
Tus denotation ntawm pawg feem pua yog (w/w)%.
Txawm hais tias cov qauv saum toj no muab lub tswv yim dav dav txog qhov feem pua ntawm huab hwm coj, daim ntawv thov ntawm cov mis nws txawv nyob ntawm seb hom ntawm cov khoom thiab cov khoom sib xyaw uas peb cuam tshuam nrog. Piv txwv li,
Rau cov tshuaj nyob rau hauv ib qho kev sib xyaw, cov feem pua xws li suav nrog hauv qab no:
Nyhav feem pua =(ntau ntawm lub caij ib mole / hnyav ntawm ib mole ntawm cov compound)100
Rau ib qho kev daws teeb meem,
Nyhav feem pua =(grams ntawm solute / grams ntawm solute plus hnyav)100
Qhov txawv ntawm Mole Fraction thiab Qhov hnyav li cas?
Mole feem thiab qhov hnyav feem pua yog ob txoj hauv kev sib txawv ntawm kev nthuav tawm cov ntsiab lus ntawm cov khoom sib xyaw. Qhov sib txawv tseem ceeb ntawm mole feem thiab qhov hnyav feem pua yog qhov feem pua ntawm mole muab cov ntsiab lus ntawm cov khoom nyob rau hauv ib qho kev sib tov los ntawm moles, thaum lub luj feem pua muab cov muaj pes tsawg leeg los ntawm loj. Tsis tas li ntawd, tus nqi ntawm mole feem yog muab raws li ib feem lossis hauv ib lossis ob qhov chaw lej thaum qhov hnyav feem pua yog muab raws li tus nqi feem pua.
Hauv qab infographic qhia txog qhov sib txawv ntawm mole feem thiab qhov hnyav feem pua.
Summary – Mole Fraction vs Nyhav%
Mole feem thiab qhov hnyav feem pua yog ob txoj hauv kev sib txawv ntawm kev nthuav tawm cov ntsiab lus ntawm cov khoom sib xyaw. Qhov sib txawv tseem ceeb ntawm mole feem thiab qhov hnyav feem pua yog qhov feem pua ntawm mole muab cov khoom sib xyaw ntawm cov khoom sib xyaw los ntawm moles, thaum qhov hnyav feem pua muab cov khoom sib xyaw los ntawm qhov hnyav.
