Chemistry yog ib qho kev tshawb fawb ntawm qhov kawg. Hauv kev nkag siab tias qhov tseeb, tiag, piav qhia qhov tseeb ntawm cov lej hauv nws yog qhov tsawg heev lossis loj heev. Ntau tus neeg yuav ntshai los ntawm tus lej nrog 23 xoom. Nws yog ntau heev. Tab sis muaj ntau ntau units (thooj) muaj nyob rau hauv ib mole ntawm ib yam khoom. Koj puas xav ua kev suav nrog cov lej zoo li no? Nws tsis xis nyob. Tab sis tam sim no, txhua tus tub ntxhais kawm daws teeb meem chemistry nrog ib daim ntawv thiab lub laij lej yooj yim. Qhov no ua tau ua tsaug rau cov lus yooj yim tshwj xeeb uas tsim los ntawm chemists. Thiab ib lo lus tseem ceeb ntawm cov lus no yog "molar mass."
Formula by definition
Kev txiav txim siab qhov molar mass yog qhov yooj yim: qhov loj ntawm cov khoom yuav tsum muab faib los ntawm nws cov tshuaj. Ntawd yog, koj yuav pom ntau npaum li cas ib mole ntawm ib qho khoom hnyav. Muaj lwm txoj hauv kev los txiav txim siab molar pawg, tab sis qhov tseem ceeb ntawm no tsis yog kom tsis meej pem. Cov molar loj yog tus lej sib npaug rau atomic lossis molecular mass. Tab sis cov units txawv.
Vim li cas?
Thaum twg koj xav tau molar loj? Ib qho piv txwv classic yog qhov yuav tsum tau txheeb xyuas cov qauv ntawm cov khoom. Tsis yog txhua yam tshuaj thiab tsis yog nyob rau hauv txhua qhov xwm txheej tuaj yeem txiav txim siab los ntawm cov khoom siv tshuaj lom neeg thiab cov tsos mob, qee zaum nws yog qhov yuav tsum tau xav txog qhov sib piv ntau. Yog tias koj paub qhov ntau npaum li cas ntawm cov khoom, koj tuaj yeem xam cov atoms thiab lawv cov proportions hauv cov khoom. Thiab koj yuav xav tau kev pab los ntawm tus kws kho mob qub. Laus heev. Mendeleev nws tus kheej.
Kev sib txuas ntawm lub tswv yim
Lub rooj ntawm tus kws tshawb fawb zoo tuaj yeem pab peb li cas? Cov molar mass ntawm ib yam khoom yog sib npaug ntawm tus lej rau atomic (rau atomic tshuaj thiab cov hlau ntshiab) los yog molecular mass, tab sis yog ntsuas nyob rau hauv lwm units. Cov yam ntxwv ntawm cov khoom no yuav raug qhia hauv grams ib mole, molecular - hauv atomic mass units. Yuav ua li cas yog tias cov lej no zoo ib yam? Cov txiaj ntsig uas koj pom nyob rau hauv lub rooj rau cov ntsiab lus tau suav empirically. Txhua hom atom tau hnyav thiab nws qhov hnyav tau txiav txim siab hauv cov chav yooj yim. Yog li ntawd, koj tsis pom qhov rho tawm nees nkaum xya degree, tab sis tus lej tsim nyog, feem ntau nyob rau hauv ib thiab ib puas. Kuj tseem muaj cov ntsiab lus hnyav, tab sis lawv feem ntau tsis hais hauv cov phau ntawv teeb meem hauv tsev kawm.
Yog tsis yog txhua tus lej nyob ntawm tes
Yuav ua li cas yog cov khoom tsim los ntawm cov molecules thiab koj paub tias nws yog dab tsi? Cov molar pawg ntawm cov tshuaj tshawb fawb li cas yog tias nws qhov loj thiab tshuaj muaj pes tsawg leeg tsis muaj nyob rau ib txhij raws li cov xwm txheej ntawm qhov teeb meem? Nws yog qhov yooj yim, nrhiav txhua hom atom (element) hauv lub rooj thiabmultiply atomic masses los ntawm tus naj npawb ntawm atoms nyob rau hauv ib tug molecule rau txawv cov ntsiab lus. Thiab tom qab ntawd koj tsuas yog suav nws - thiab koj tau txais qhov hnyav molecular, uas yuav haum raws li cov molar loj. Txhua yam twb tau npaj rau cov tub ntxhais hluas chemists niaj hnub no - rau cov qauv paub ntawm cov tshuaj, nws tsis yog teeb meem los xam tus nqi xav tau.
Yog koj nkag siab qhov tseem ceeb ntawm chemistry, nws yuav zoo li yooj yim rau koj. Lub luag haujlwm tseem ceeb hauv kev txhim kho ntawm kev tshawb fawb no yog kawm thiab cim cov khoom ntawm cov khoom tshwj xeeb, tab sis cov txheej txheem dav dav thiab cov lus piav qhia tsis yooj yim dua. Thaum koj nkag siab, xyaum - koj yuav tsis nkag siab hauv koj lub neej.
