Qhov Sib Txawv Ntawm Mole Fraction thiab Mass Fraction

2024 Tus sau: Alex Aldridge | [email protected]. Kawg hloov kho: 2023-12-17 13:40

Qhov Tseem Ceeb - Mole Fraction vs Mass Fraction

Mole feem thiab pawg pawg yog cov ntsiab lus siv los nthuav qhia qhov sib txawv ntawm cov khoom sib txawv hauv cov tebchaw. Qhov sib txawv tseem ceeb ntawm mole feem thiab pawg pawg yog tias mole feem cuam tshuam nrog cov moles ntawm cov khoom sib txawv ntawm cov khoom sib txuas thaum cov feem ntau cuam tshuam nrog cov pawg ntawm cov khoom sib txawv hauv ib qho chaw. Mole feem tuaj yeem hloov pauv mus rau hauv feem ntau ntawm tib qho kev sib txuas thiab rov ua dua.

Mole Fraction yog dab tsi?

Mole feem yog qhov piv ntawm cov khoom ntawm cov khoom hauv ib qho sib tov qhia los ntawm lawv cov lej ntawm moles. Nws yog qhov sib piv ntawm cov moles ntawm cov khoom siv thiab cov lej ntawm moles ntawm tag nrho cov khoom sib xyaw. Nws tuaj yeem muab tau raws li hauv qab no.

Mole fraction=moles of a constituent/sum of moles of all constituents (mass of the mix)

Or

X_i=n_i / n_total

Cov mole feem ntawm tag nrho cov khoom sib npaug 1 vim qhov mole feem yog qhov piv. Cov feem mole tuaj yeem siv los qhia qhov feem pua mole los ntawm kev muab cov mole feem los ntawm 100. Cov feem mole kuj tseem tuaj yeem hu ua tus lej feem ntau vim tias moles muab tus nqi ntawm cov khoom siv. Mole feem yog chav-tsawg vim nws yog qhov piv ntawm moles (units tshem tawm).

Daim duab 01: Qhov ntom ntawm NaCl raws li Kev Ua Haujlwm ntawm Mole Fraction

Calculation of Mole Fraction

Cia peb xav txog ib qho teeb meem kom nkag siab tias mole feem yog dab tsi.

Qhia:

Nrhiav cov mole feem ntawm NaCl thaum 0.1 mol ntawm NaCl yog yaj hauv 100 grams dej ntshiab.

Teb:

Ntau tus moles dej=100 g / 18 gmol^-1

=5.56 mol

Sum of moles of all constituents=0.1 (NaCl) + 5.56 (H_2O)

=5.66 mol

NaCl=0.1 mol / 5.66 mol

=0.018

Dab tsi yog pawg feem ntau?

Mass feem yog qhov piv ntawm qhov loj ntawm cov khoom sib xyaw thiab tag nrho cov khoom sib xyaw. Txij li nws yog qhov sib piv ntawm cov pawg, qhov loj feem ntau yog unit-tsawg (units tshem tawm). Nws tuaj yeem muab tau raws li qhov sib npaug (muab hauv qab).

Mass feem=pawg ntawm cov khoom sib xyaw / cov lej ntawm tag nrho cov khoom sib xyaw (qhov loj ntawm qhov sib tov)

Or

W_i =m_i / m_total

Cov feem ntau ntawm tag nrho cov khoom yog sib npaug rau 1 vim qhov loj feem yog qhov piv. Qhov loj feem ntawm cov khoom ib txwm ib txwm qis dua 1. Cov feem pua ntawm cov khoom tuaj yeem muab tau raws li qhov feem pua ntau thiab. Ntawm no, qhov loj feem yog muab faib los ntawm 100. Hauv kev txheeb xyuas cov ntsiab lus, feem ntau yog hais txog qhov sib piv ntawm qhov loj ntawm cov khoom siv tshuaj thiab cov khoom sib xyaw. Cov feem ntau yog ywj siab ntawm qhov kub thiab txias vim huab hwm coj tsis hloov thaum qhov kub hloov pauv.

Calculation involving Mass Fraction

Qhia:

Nrhiav qhov loj ntawm sucrose nyob rau hauv ib qho kev daws ntawm sucrose (500 g) nyob rau hauv uas dej muaj ib feem ntawm 0.65.

Teb:

tag nrho ntawm qhov sib tov=500 g

Mass feem ntawm dej=0.65

Tom qab ntawd qhov seem ntawm sucrose=1-0.65=0.35

Qhov loj ntawm sucrose=0.35 x 500g

=175 g

Dab tsi yog qhov zoo sib xws ntawm Mole Fraction thiab Mass Fraction?

• Ob nqe lus nthuav qhia piv txwv.
• Ob qhov mole feem thiab pawg loj yog cov ntsiab lus tsawg dua.
• Ob leeg muab cov txiaj ntsig uas sib npaug lossis tsawg dua 1.
• Ob leeg yog ywj siab ntawm kev hloov pauv kub.

Qhov txawv ntawm Mole Fraction thiab Mass Fraction yog dab tsi?

Mole Fraction vs Mass Fraction
Mole feem yog qhov sib piv ntawm cov moles ntawm cov khoom sib xyaw thiab cov txiaj ntsig ntawm moles ntawm txhua qhov sib xyaw ua ke.	Mass feem yog qhov sib piv ntawm qhov loj ntawm cov khoom sib xyaw thiab tag nrho cov khoom sib xyaw.
Mole feem yog suav nrog moles ntawm cov neeg suav.	Mass feem yog xam los ntawm cov khoom siv ntau.

Summary – Mole Fraction vs Mass Fraction

Mole feem thiab pawg pawg yog siv los qhia cov txheeb ze feem ntawm cov khoom sib txawv hauv kev sib xyaw. Ob qho tib si yog cov ntsiab lus-tsawg dua vim tias qhov sib piv muaj tib lub tsev, thiab yog li cov units tshem tawm. Qhov sib txawv tseem ceeb ntawm mole feem thiab pawg loj yog tias mole feem cuam tshuam nrog cov moles ntawm cov khoom sib txawv ntawm cov khoom sib xyaw whereas pawg feem cuam tshuam nrog ntau qhov sib txawv ntawm cov khoom sib txawv.