Thermochemical txhais li cas?
Thermochemical txhais li cas?

Video: Thermochemical txhais li cas?

Video: Thermochemical txhais li cas?
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Thermochemistry yog txoj kev kawm ntawm lub tshav kub zog uas yog cuam tshuam nrog cov tshuaj tiv thaiv thiab / lossis kev hloov ntawm lub cev. Cov tshuaj tiv thaiv tuaj yeem tso tawm lossis nqus tau lub zog, thiab kev hloov pauv yuav tshwm sim ua tib yam, xws li hauv melting thiab boiling.

Ua kom pom qhov no, qhov sib npaug ntawm cov thermochemical yog dab tsi?

(−110.5 kJ) + (−283.0 kJ) = (−393.5 kJ) = ΔH of Kev tshwm sim (1) EXAMPLE OF THERMOCHEMICAL EQUATION YOG Thaum cov roj methane yog combusted, cua sov tso tawm, ua rau cov tshuaj tiv thaiv exothermic. Nyob rau hauv tus txheej txheem, 890.4 kJ raug tso tawm thiab yog li nws tau sau raws li cov khoom ntawm cov tshuaj tiv thaiv.

Tsis tas li ntawd, ΔH txhais li cas? Hloov hauv enthalpy

Ib sab saum toj no, vim li cas peb thiaj li yuav tsum kawm txog kev sib npaug ntawm cov thermochemical?

Thermochemical sib npaug suav nrog kev hloov hluav taws xob li ntawd peb tuaj yeem pom tias cov tshuaj tiv thaiv yog exothermic lossis endothermic. Tus nqi ntawm lub zog hauv ib qho chaw tuaj yeem txiav txim siab los ntawm kev kub hnyiab hauv ib lub calorimeter thiab pom tias nws tawm ntau npaum li cas.

Kuv yuav xam enthalpy li cas?

Siv cov qauv ∆H = m x s x ∆T daws. Thaum koj muaj m, qhov loj ntawm koj cov reactants, s, qhov tshwj xeeb kub ntawm koj cov khoom, thiab ∆T, qhov kub thiab txias hloov ntawm koj cov tshuaj tiv thaiv, koj tau npaj los nrhiav cov enthalpy ntawm cov tshuaj tiv thaiv. Tsuas ntsaws koj qhov tseem ceeb rau hauv qauv ∆H = m x s x ∆T thiab multiply to solve.

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