Video: Yuav ua li cas koj pom tus qauv enthalpy ntawm tsim los ntawm combustion?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov txheem enthalpy ntawm cov tshuaj tiv thaiv (ΔHorxn ua) tuaj yeem yog xam los ntawm cov sum standard enthalpies ntawm kev tsim ntawm cov khoom (txhua qhov sib npaug los ntawm nws cov stoichiometric coefficient) rho tawm cov lej ntawm standard enthalpies ntawm kev tsim ntawm cov reactants (txhua qhov sib npaug los ntawm nws cov stoichiometric coefficient) - cov khoom lag luam
Ib yam li ntawd, tus qauv enthalpy ntawm combustion yog dab tsi?
Standard enthalpy ntawm combustion yog txhais raws li tus enthalpy hloov thaum ib tug mole ntawm ib tug compound yog tag nrho burnt nyob rau hauv oxygen nrog tag nrho cov reactants thiab cov khoom nyob rau hauv lawv txheem xeev hauv qab txheem tej yam kev mob (298K thiab 1 bar siab).
Kuj Paub, dab tsi yog cov units ntawm enthalpy? Cov SI unit rau qhov tshwj xeeb enthalpy yog joule ib kilogram. Nws tuaj yeem hais tawm hauv lwm qhov tshwj xeeb los ntawm h = u + pv, qhov twg u yog lub zog tshwj xeeb sab hauv, p yog qhov siab, thiab v yog qhov ntim tshwj xeeb, uas yog sib npaug rau 1ρ, qhov twg ρ yog qhov ceev.
Ib tug kuj yuav nug, koj txhais li cas enthalpy?
Enthalpy yog ib qho khoom siv thermodynamic ntawm ib qho system. Nws yog tus lej ntawm lub zog sab hauv ntxiv rau cov khoom ntawm lub siab thiab ntim ntawm qhov system. Nws qhia txog lub peev xwm ua haujlwm tsis yog siv tshuab thiab lub peev xwm tso tawm cua sov. Enthalpy yog denoted li H; tshwj xeeb enthalpy npe h.
Dab tsi yog enthalpy ntawm h2o?
enthalpy ntawm formation rau H2O (l)(-285.8kJ/mol) yog me dua qhov ntawd rau H2O (g)(-241.82kJ/mol).
Pom zoo:
Yuav ua li cas koj pom tus qauv sib txawv thiab txhais li cas ntawm Excel?
Standard deviation yog ib qho kev ntsuas ntawm ntau npaum li cas variance muaj nyob rau hauv ib pawg ntawm cov zauv piv rau theaverage (txhais tau tias) ntawm cov zauv. Txhawm rau xam qhov sib txawv ntawm Excel, koj tuaj yeem siv ib qho ntawm ob txoj haujlwm tseem ceeb, nyob ntawm cov ntaub ntawv teev. Yog tias cov ntaub ntawv sawv cev rau tag nrho cov pejxeem, koj tuaj yeem siv STDEV. Pfunction
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