Lub atomic mass unit ntsuas li cas?
Lub atomic mass unit ntsuas li cas?

Video: Lub atomic mass unit ntsuas li cas?

Video: Lub atomic mass unit ntsuas li cas?
Video: Avogadro's Number, The Mole, Grams, Atoms, Molar Mass Calculations - Introduction 2024, Kaum ib hlis
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Atomic mass unit . Ib atomic mass unit (abbreviated: amu, u, or Da) yog a chav tsev ntawm ntsuas uas yog siv rau ntsuas tus pawg ntawm atoms . Cov atomic mass unit yog sib npaug rau cov?112 ntawm pawg cov pa roj carbon-12. Lo lus 'dalton' tau siv ntau lub sijhawm.

Nyob rau hauv txoj kev no, atomic mass ntsuas li cas?

Cov atomic loj ntawm ib lub ntsiab yog qhov nruab nrab pawg ntawm atoms ntawm ib yam ntsuas hauv atomic loj unit (amu, tseem hu ua daltons, D). Cov atomic loj yog qhov hnyav nruab nrab ntawm tag nrho cov isotopes ntawm lub caij ntawd, uas yog pawg ntawm txhua tus isotope yog muab faib los ntawm kev nplua nuj ntawm cov isotope tshwj xeeb.

Tsis tas li ntawd, puas atomic mass muaj units? Thaum atomic loj yog qhov tseeb pawg , txheeb ze isotopic pawg yog ib tug dimensionless tooj uas tsis muaj units . Piv txwv li, tus txheeb ze isotopic pawg cov pa roj carbon-12 atom yog raws nraim 12. Rau kev sib piv, lub atomic loj cov pa roj carbon-12 atom yog raws nraim 12 daltons.

Ua qhov no hauv kev txiav txim siab, qhov ntau npaum li cas yog ntsuas hauv atomic mass unit?

Atomic loj . Atomic loj , cov kom muaj nuj nqis ntawm qhov teeb meem muaj nyob rau hauv ib qho atom ntawm ib yam. Nws yog qhia raws li ib tug ntau yam ntawm ib tug kaum ob lub pawg cov pa roj carbon-12 atom , 1.992646547 × 1023 gram, uas yog muab rau ib atomic loj ntawm 12 units . Hauv qhov ntsuas no 1 atomic mass unit (amu) sib raug rau 1.660539040 × 1024 grams.

Dab tsi yog atomic mass unit hauv chemistry?

Hauv chemistry , ib atomic mass unit los yog AMU yog lub cev tas li sib npaug rau ib feem kaum ob ntawm qhov pawg ntawm qhov tsis sib xws atom cov pa roj carbon-12. Nws yog ib chav tsev ntawm pawg siv los qhia atomic masses thiab molecular pawg.

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