Video: Qhov feem pua txhais li cas hauv chemistry?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Pawg feem pua yog ib txoj hauv kev los sawv cev rau qhov concentration ntawm cov khoom nyob rau hauv ib tug compound los yog ib tug tivthaiv nyob rau hauv ib tug sib tov. Pawg feem pua yog xam raws li qhov loj ntawm ib feem muab faib los ntawm tag nrho cov loj ntawm cov sib tov, multiplied los ntawm 100%.
Tsis tas li ntawd, kev daws 2% txhais li cas?
2 % w / w daws txhais tau tias grams ntawm solute yog yaj nyob rau hauv 100 grams ntawm daws . 3% v / w daws txhais tau tias 3 ml ntawm solute yog yaj nyob rau hauv 100 grams ntawm daws.
Tom qab, lo lus nug yog, dab tsi yog wt% hauv chemistry? wt %. Hauv koj qhov xwm txheej 25 wt % ntawm tetramethylammonium hauv methanol txhais tau tias, muaj 25g ntawm tetramethylammonium rau txhua 100g ntawm methanol.
Qhov thib ob, qhov kev daws teeb meem 1% txhais li cas?
A ib feem pua daws yog txhais raws li 1 gram ntawm solute ib 100 milliliters zaum kawg ntim. Piv txwv li, 1 gram ntawm sodium chloride, coj mus rau qhov kawg ntim ntawm 100 ml nrog dej distilled, yog a 1 % NaCl daws . Kom pab nco qab lub ntsiab txhais ntawm a 1 % daws , nco ntsoov tias ib gram yog qhov loj ntawm ib milliliter dej.
Koj pom li cas feem pua hauv chemistry?
Qhov yooj yim qauv rau pawg feem pua ntawm ib tug compound yog: mass feem pua = (mas tshuaj /tag nrho pawg ntawm cov compound) x 100. Koj yuav tsum tau muab faib los ntawm 100 thaum kawg los qhia qhov tus nqi as a feem pua.
Pom zoo:
Koj pom qhov theoretical feem pua ntawm cov pa oxygen hauv KClO3 li cas?
Qhov kev sim feem pua ntawm cov pa oxygen hauv cov qauv ntawm KClO3 yog xam los ntawm kev siv qhov sib npaug no. Kev sim % oxygen = Mass of oxygen poob x 100 Mass ntawm KClO3 Tus nqi theoretical ntawm % oxygen hauv potassium chlorate yog xam los ntawm cov mis KClO3 nrog molar mass = 122.6 g / mol
Qhov feem ntawm 33 1 3 feem pua yog dab tsi?
Piv txwv tus nqi feem pua ntawm cov zauv feem 25% 0.25 1/4 331/3% 0.333 1/3 50% 0.5 1/2 75% 0.75 3/4
Yuav ua li cas koj sau ib feem raws li ib tug khoom ntawm ib tug tag nrho cov zauv thiab ib feem feem?
Cov cai los nrhiav cov khoom ntawm ib feem feem thiab tag nrho tus lej Peb xub sau tag nrho cov lej ua ib feem, piv txwv li, sau nws faib los ntawm ib qho; Piv txwv li: 7 yog sau ua 71. Peb mam li muab cov zauv. Peb muab cov denominators. Yog tias yuav tsum tau ua kom yooj yim, nws ua tiav thiab tom qab ntawd peb sau cov feem kawg
Qhov feem pua ntawm qhov loj ntawm BR hauv CuBr2 yog dab tsi?
Cov feem pua ntawm cov ntsiab lus Element Symbol Mass Percent Copper Cu 28.451% Bromine Br 71.549%
Qhov twg ntawm cov ntsiab lus hauv qab no feem ntau pom nyob rau hauv feem ntau cov chiv?
Cov tshuaj chiv niaj hnub suav nrog ib lossis ntau tshaj ntawm peb lub ntsiab lus tseem ceeb tshaj plaws hauv cov zaub mov noj: nitrogen, phosphorus, thiab potassium. Qhov tseem ceeb thib ob yog cov ntsiab lus sulfur, magnesium, thiab calcium