Qhov sib txawv tseem ceeb ntawm pawg feem pua thiab feem pua ntawm cov khoom sib xyaw yog qhov loj feem pua muab qhov sib piv ntawm qhov loj ntawm ib qho khoom sib xyaw thiab tag nrho cov khoom sib xyaw, qhov feem pua ntawm cov khoom sib xyaw muab cov feem pua ntawm txhua cov tshuaj. element nyob rau hauv ib tug mix.
Txawm hais tias cov ntsiab lus loj feem pua thiab feem pua ntawm cov ntsiab lus siv sib hloov, lawv yog cov ntsiab lus sib txawv. Qhov loj feem pua hais txog qhov feem pua ntawm cov khoom sib xyaw hauv qhov sib tov, thaum qhov feem pua ntawm cov ntsiab lus hais txog qhov feem pua ntawm cov khoom siv tshuaj lom neeg hauv kev sib tov.
Puas yog dab tsi?
Mass feem pua yog feem pua ntawm qhov loj ntawm ib qho khoom sib xyaw. Lub sij hawm 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:
Mass feem pua =(ntau ntawm cov khoom / tag nrho cov khoom sib xyaw)100
Tus denotation ntawm huab hwm coj feem pua yog raws li nram no:
(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:
Mass feem pua =(ntau ntawm lub caij ib mole / loj ntawm ib mole ntawm lub compound)100
Rau ib qho kev daws teeb meem,
Mass feem pua =(grams ntawm solute/grams ntawm solute plus hnyav)100
Percent Composition yog dab tsi?
Percent muaj pes tsawg leeg muab cov feem pua ntawm txhua cov tshuaj nyob rau hauv ib qho sib tov. Lub sij hawm sib txawv ntawm qhov feem pua ntawm cov feem pua xws li cov feem pua ntawm cov ntsiab lus qhia txog cov ntsiab lus ntawm cov tshuaj lom neeg, cov khoom sib xyaw, thiab cov kuab tshuaj nyob rau hauv ib qho sib tov, thaum cov feem pua ntawm cov ntsiab lus muab cov feem pua ntawm tag nrho cov tshuaj.
Daim duab 01: Feem pua ntawm tib neeg lub cev
Hauv lwm lo lus, feem pua ntawm cov ntsiab lus yog feem pua ntawm cov khoom ntawm txhua lub hauv paus. Piv txwv li, qhov feem pua ntawm cov dej molecule yog 20% hydrogen thiab 80% oxygen.
Dab tsi yog qhov txawv ntawm pawg feem pua thiab feem pua ntawm cov ntsiab lus?
Txawm hais tias cov ntsiab lus loj feem pua thiab feem pua ntawm cov ntsiab lus siv sib hloov, lawv yog cov ntsiab lus sib txawv. Qhov sib txawv tseem ceeb ntawm pawg feem pua thiab cov feem pua ntawm cov muaj pes tsawg leeg yog qhov loj feem pua muab qhov sib piv ntawm qhov loj ntawm cov khoom sib xyaw hauv cov khoom sib tov thiab tag nrho cov khoom sib xyaw, qhov feem pua ntawm cov khoom sib xyaw muab cov feem pua ntawm txhua cov tshuaj hauv cov khoom sib tov. Tsis tas li ntawd, peb tuaj yeem txiav txim siab qhov feem pua ntawm cov dej hauv ntsev los ntawm kev faib cov dej los ntawm tag nrho cov qauv, muab faib ua 100. Ua piv txwv rau feem pua ntawm cov dej hauv cov ntsev, peb tuaj yeem hais tias feem pua ntawm cov dej molecule yog 20%. hydrogen thiab 80% oxygen.
Cov hauv qab no qhia txog qhov sib txawv ntawm pawg feem pua thiab feem pua ntawm cov khoom xyaw.
Summary – Mass Percent vs Percent Composition
Txawm hais tias cov ntsiab lus loj feem pua thiab feem pua ntawm cov ntsiab lus siv sib hloov, lawv yog cov ntsiab lus sib txawv. Hauv cov ntsiab lus, qhov sib txawv tseem ceeb ntawm pawg feem pua thiab cov feem pua ntawm cov muaj pes tsawg leeg yog qhov loj feem pua muab qhov sib piv ntawm qhov loj ntawm ib qho khoom sib tov thiab tag nrho cov khoom sib xyaw, qhov feem pua ntawm cov khoom sib xyaw ua rau cov feem pua ntawm cov khoom siv hauv cov tshuaj. sib tov.
