Video: Koj yuav pom qhov ua txhaum ntawm cov kua dej li cas?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Molality . Ib txoj hauv kev kawg los nthuav qhia qhov concentration ntawm a kev daws teeb meem yog ntawm nws kev ua txhaum . Cov kev ua txhaum (m) ntawm a kev daws teeb meem yog moles ntawm solute faib los ntawm kilograms ntawm hnyav. A kev daws teeb meem uas muaj 1.0 mol ntawm NaCl yaj rau hauv 1.0 kg ntawm dej yog "ib leeg" kev daws teeb meem ntawm sodium chloride.
Kuj paub yog, koj yuav pom qhov ua txhaum ntawm kev daws teeb meem li cas?
Tsuas yog suav tus lej, x, los ntawm 1 kg tshaj 1,000,000 grams. Qee zaum, peb tau muab tus lej ntawm cov tshuaj daws. Molality yog moles ntawm solute ib kilogram ntawm hnyav. Txhawm rau hloov tus lej ntawm cov solute rau moles ntawm solute, peb ua raws qhov sib npaug: moles ntawm solute = pawg ntawm solute / molar mass solute.
Qhov thib ob, Molality piv txwv yog dab tsi? Molality yog txhais raws li tus naj npawb ntawm cov kuab tshuaj tam sim no hauv 1000 gm ntawm cov kuab tshuaj. Tsis zoo li molarity, kev ua txhaum tsis hloov nrog qhov kub vim tias huab hwm coj cuam tshuam los ntawm kev hloov pauv kub. Piv txwv : Xam cov kev ua txhaum ntawm kev daws teeb meem npaj los ntawm 29.22 grams NaCl hauv 2.00 kg dej.
Ib qho ntxiv, koj yuav ua li cas thiaj daws tau 1 Molality?
Qhov concentration ntawm solute hauv a kev daws teeb meem kuj tseem tuaj yeem hais tawm hauv chav ntawm kev ua txhaum . A ib qho molal tov muaj 1 mole ntawm solute rau 1000 g ( 1 kg) ntawm cov kuab tshuaj. Rau npaj a ib qho molal tov ntawm sucrose koj yuav hnyav ib mole ntawm sucrose rau hauv lub khob thiab ntxiv 1000 g dej ( 1 hli).
Dab tsi yog qhov ua txhaum ntawm NaCl hauv qhov kev daws teeb meem no?
Plug tus nqi moles thiab qhov hnyav ntawm qhov hnyav rau hauv kev ua txhaum mis. Faib 1.2 mol los ntawm 1.5 kg, thiab koj yuav pom tias qhov kev ua txhaum ntawm Cov tshuaj NaCl yog 0.8 molal (hauv tus qauv kev ua txhaum chav nyob: 0.8 mol/kg).
Pom zoo:
Koj yuav tshuaj xyuas cov kua dej ntawm 2001 Nissan Pathfinder li cas?
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