Video: Dab tsi yog enthalpy ntawm calcium chloride?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Qhov ntsuas tus nqi rau lub enthalpy ntawm kev daws rau anhydrous calcium chloride (tus nqi uas peb tab tom sim xam ntawm no) yog hais txog -80 kJ mol-1.
Hauv qhov no, dab tsi yog enthalpy ntawm CaCl2?
Thermodynamic zog
| Theem tus cwj pwm | |
|---|---|
| Std enthalpy hloov ntawm kev tsim, ΔfHokhov kho | -795.4 kJ/mol |
| Standard molar entropy, Sokhov kho | 108.4 J / (mol K) |
| Thaum tshav kub kub muaj peev xwm, cp | 72.9 J / (mol K) |
| Cov khoom ua kua | |
Tsis tas li ntawd, koj ua li cas xam cov enthalpy ntawm kev daws teeb meem? Txhawm rau xam cov enthalpy ntawm kev daws (kub ntawm kev daws) siv cov ntaub ntawv sim:
- Tus nqi ntawm lub zog tso tawm los yog absorbed yog xam. q = m x cg × ΔT. q = lub zog tso tawm lossis nqus tau.
- xam moles ntawm solute. n = m ÷ M.
- Tus nqi ntawm lub zog (tshav kub) tso tawm los yog absorbed ib mole ntawm solute yog xam. Δ Hsoln = q ÷ n.
Hauv qhov no, lattice zog ntawm CaCl2 yog dab tsi?
−795.8 kJ = LE + 2(−349 kJ) + 244 kJ + 1145 kJ + 590 kJ + 178.2 kJ. Lattice Zog rau CaCl 2 (s) = −2255 kJ.
Calcium chloride tau txais li cas?
Calcium chloride yog ntsev uas yuav ua tau tau los ntawm tej yam ntuj tso brines raws li ib tug by-product los ntawm hluavtaws soda tshauv ntau lawm, thiab yuav ua tau los ntawm hydrochloric acid thiab limestone. Tag nrho peb txoj kev yog siv, nrog rau txoj kev siv hluavtaws siv rau qhov loj tshaj plaws ntawm cov ntim.
Pom zoo:
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