Cov txheej txheem:

Koj yuav daws tau qhov kub ntawm cov tshuaj tiv thaiv li cas?
Koj yuav daws tau qhov kub ntawm cov tshuaj tiv thaiv li cas?

Video: Koj yuav daws tau qhov kub ntawm cov tshuaj tiv thaiv li cas?

Video: Koj yuav daws tau qhov kub ntawm cov tshuaj tiv thaiv li cas?
Video: Kuv yuav txhaj tshuaj tiv thaiv li cas? 2024, Kaum ib hlis
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Enthalpy of Solution (Huab cua sov ntawm kev daws) Piv txwv

  1. xam tus kub tso tawm, q, hauv joules (J), los ntawm tshuaj tiv thaiv : q = mass(dej) × specification kub Peev xwm (dej) × hloov kub ( daws )
  2. xam cov moles ntawm solute (NaOH(s)): moles = mass ÷ molar mass.
  3. xam tus enthalpy change, ΔH, kJ mol-1 ntawm solute:

Ib yam li ntawd, koj pom qhov kub ntawm kev tsim ua li cas?

Qhov kev sib npaug no tseem ceeb hais tias tus qauv enthalpy hloov ntawm tsim yog sib npaug rau cov lej ntawm tus qauv enthalpies ntawm tsim ntawm cov khoom rho tawm cov lej ntawm tus qauv enthalpies ntawm tsim ntawm cov reactants. thiab tus qauv enthalpy ntawm kev tsim Tus nqi: ΔH fo[A] = 433 KJ/mol. Δ H fo[B] = -256 KJ/mol.

Tom qab ntawd, lo lus nug yog, qhov kub ntawm kev daws txhais li cas? Txhais ntawm cua sov ntawm kev daws .: cov kub evolved los yog absorbed thaum ib yam khoom dissolves tshwj xeeb: tus nqi koom nrog thaum ib tug mole los yog tej zaum ib gram dissolves nyob rau hauv ib tug loj tshaj ntawm cov kuab tshuaj.

Kuj paub, koj ua li cas xam cov kev hloov hauv tshav kub?

Thaum twg kub kev hloov pauv tau koom nrog, siv cov qauv no: hloov nyob rau hauv kub = Q / cm rau xam tus hloov nyob rau hauv kub los ntawm ib tug tshwj xeeb npaum li cas ntawm kub ntxiv. Q sawv cev rau kub ntxiv, c yog qhov tshwj xeeb kub muaj peev xwm ntawm cov khoom koj nyob nraum cua sov, thiab m yog qhov loj ntawm cov khoom koj nyob nraum cua sov.

Qhov kub ntawm combustion txhais li cas?

Kub ntawm combustion (ΔH°c) yog cov ntsuas tus nqi ntawm lub zog tso tawm nyob rau hauv daim ntawv ntawm kub (q) thaum ib tug mole ntawm ib yam khoom raug hlawv ( combustion ). Kev tsim tawm ntawm kub txhais tau hais tias cov tshuaj tiv thaiv yog txheej txheem exothermic thiab muab tawm lub zog.

Pom zoo: