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Yl10_lah - 1 Vesinikasiidi(HN3 aururhk 22,75 C juures on 58...

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1. Vesinikasiidi (HN 3 ) aururõhk –22,75 °C juures on 58 torri ja 25,0 °C juures 512 torri. Arvutage vesinikasiidi standardne aurustumisentalpia, standardne aurustumisentroopia, standardne aurustumise vabaenergia, keemistemperatuur normaaltingimustel. Lahendus: ln p 2 p 1 = H v R ⋅ 1 T 1 1 T 2 ⇒ H v = R ln p 2 p 1 1 T 1 1 T 2 = 8.314 J K mol ln 512 T 58 T 1 250.4 1 298.15 = 28310 J mol ln p p 0 = − H v o RT S v o R ⇒ S v o = Rln p p 0 H v o T S v o = 8.314 J K mol ln 512 Torr 760 Torr 28310 J mol 289.15 K = . 91 7 J mol K G v o = H v o T ⋅ S v o = 28310 J mol 298.15 K 91.7 J K mol = 983 J mol Keemistemperatuurile vastab, et p = p 0 ln p p 0 = 0 ja saame − H v o RT S v o R = 0 H v o RT = S v o R T b = H v o S v o = 28310 J mol 91.7 J K mol = 308.7 K = . 35 7 o C Vastus : 28.31 kJ/mol; 91.7 J/(K*mol); 983 J/mol; 308.7 K 2. Heeliumi faasidiagramm on toodud kõrval. Milline on vedela He-II eksisteerimise maksimaalne temperatuur? Milline on heeliumi normaalne keemistemperatuur? Kas tahke heelium saab sublimeeruda? 3. Süsiniku faasidiagramm on toodud kõrval. Millist rõhku on vaja rakendada, et 2000 K juures muuta grafiit teemandiks? Milline on minimaalne temperatuur vedela süsiniku eksisteerimiseks rõhul 10 000 atm?
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