Usebenza njani ngeMolality and Mole Fractions

Ngu-Peter J. Mikulecky, uChris Hren

Njengomahluko kumagama abo, umahluko osebenzayo phakathi Ubungakanani kwaye isandi ubuqili. Jonga ngononophelo iinkcazo zabo, ezichazwe ecaleni komnye kwezi zilandelayo:



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Amanani ngokulinganayo ngokobuninzi kunye nobukhulu ziyafana, kodwa iidinomineyitha zahluke kakhulu. I-Molarity ijongana neelitha zesisombululo, ngelixa ubuninzi bujongana neekhilogram zesisombululo. A isisombululo ngumxube wesinyibilikisi kunye nesinyibilikisi; a inyibilikisi yindlela ekuxutywa ngayo isolute.

Iziphumo zobusi basebukhosini

Olunye uxinaniso kwisiphithiphithi / isiphithiphithi sokudideka yindlela yokwahlula phakathi kwezinto eziguquguqukayo kunye neeyunithi. Ukucacisa le plethora ye m -amagama kunye nezifinyezo, jonga itafile.



M Amagama ahambelana noThintelo
Igama Eyahlukileyo Isifinyezo seYunithi
Ubungakanani M M
Isimbuku m m
Iinyama - Isol

Ngamaxesha athile, unokucelwa ukuba ubale i iqhezu iqhekeza yesisombululo, esisilinganiselo senani lee-moles ze nokuba yeyiphi nyibilikisa okanye usinyibilikise kwisisombululo kwinani lilonke leemmozi zesolute kwaye isisombululo kwisisombululo. Iikhemisti zichaze obu bungakanani zisebenzisa umahluko X. Ewe kunjalo, oosokhemesti kusafuneka bahlula phakathi kwamaqhekeza e-solute kunye nesinyibilikisi, ngelishwa bobabini baqala ngonobumba. s .

Ukuthintela ukudideka, bagqibe kwelokuba bashunqule isolute kunye nesinyibilikisi njengo-A kunye no-B, ngokwahlukeneyo kwifomula ngokubanzi. Ngokwenza oko, iifomula zeekhemikhali zesinyibilikisi kunye nesinyibilikisi zihlala zibhalwa njengemirhumo endaweni ka-A kunye no-B. Umzekelo, iqhezu le-mole chloride yesisombululo liya kubhalwa njenge X I-NaCl.

Ngokubanzi, umlinganiso we-mole kwisisombululo kwisisombululo uchazwa njenge



ipilisi eluhlaza mc 14

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Phi n UKUYAlinani leemoleyuli zesolute kunye n Blinani le-moles yesinyibilikisi. Umlinganiselo we-mole solvent ke ngoko

Ipilisi yeorenji emalunga ne-100

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La maqhekeza e-mole aluncedo kuba amele umyinge wesinyibilikisi kunye nesinyibilikisi kwisisombululo kakuhle kwaye ikunike ukuqonda ngokubanzi malunga nokuba isisombululo sisinyibilikisi esingakanani kwaye sisinyibilikisi esingakanani.

Apha ' Umzekelo: Zingaphi iigrama ze-dihydrogen sulfide (HMbiniS) kufuneka wongeze kwi-750 g yamanzi ukwenza i-0.35 m isisombululo?

Le ngxaki ikunika ukungunda kunye nobunzima besinyibilikisi kwaye ikucela ukuba usombulule ubunzima besinyibilikisi. Ngenxa yokuba i-molality ibandakanya i-moles kwaye ingeyiyo i-gram ye-solute, kufuneka uqale usombulule i-moles ye-solvent, emva koko usebenzise ubunzima begram ye-sodium chloride ukusombulula inani leegrama ze-solute.

Ngaphambi kokufaka amanani kwi-equality molation, kufuneka uqaphele ukuba ingxaki ikunike ubunzima be-solvent kwiigrama, kodwa ifomula ifuna ukuba ibe ziikhilogram. Ukuhamba ukusuka kwiigram ukuya kwiikhilogram kulingana nokuhambisa indawo yedesimali kwindawo ezintathu ngasekhohlo. Ukufaka yonke into oyaziyo kwi-equation ye-molality kukunika oku kulandelayo:

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yintoni ibhalsam yengwe

Ukusombulula into engaziwayo kukunika i-0.26 ye-HMbiniS kwisisombululo. Kuya kufuneka uliphindaphinde eli xabiso leemolekyuli ngobunzima beemolekyuli zikaHMbiniS ukumisela inani leegrama ekufuneka zongeziwe:

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Ke, uyafuna 8.9 iigrama ze-dihydrogen sulfide (H Mbini S) ukwenza 0.35 m isisombululo.