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Yl9_vast - 1 Inimkeha toodab soojust vimsusega 100...

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1. Inimkeha toodab soojust võimsusega 100 W (1W=1J/s). Millise kiirusega toodab keha entroopiat keskkonda, mille temperatuur on 20°C? Kui palju entroopiat toodab inimkeha 1 ööpäeva jooksul? Kas see entroopiakogus on 30°C juures suurem või väiksem? Miks? Vastus: 0.34 J/(K*sek); 29.5 kJ/K; väiksem 2. Arvutage 1 mooli üheaatomilise ideaalgaasi entroopiamuut tema pöörduval soojendamisel 37.6°C-lt 157.9°C-ni a) konstantsel rõhul ja b) konstantsel ruumalal! Eeldame, et üheaatomilise ideaalgaasi soojusmahtuvus ei sõltu temperatuurist! Vastus: 6.8 J/K; 4.08 J/K 3. Arvutage 7.29 mooli üheaatomilise ideaalgaasi entroopiamuut tema a) isotermilisel paisumisel 2.475 liitrilt 10.589 liitrini ja b) isotermilisel kokkusurumisel 6.72 atm-lt 13.44 atm-ni ! Vastus: 88.1 J/K; -42.0 J/K 4. Ennustage etanaali, CH 3 CHO, keemistemperatuur lähtudes tema tekkeentalpiatest gaasi- (-166.19 kJ/mol) ja vedelas faasis (-192.3 kJ/mol) ning molaarsetest entroopiatest gaasi- (250.3 J/(K*mol)) ja vedelas faasis (160.2 J/(K*mol))! Võrrelge saadud tulemust etanaali eksperimentaalse keemistemperatuuriga (20.8°C)! Millest võiks teie arvates tuleneda
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