Seman 3 ciclo de carnot
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Transcript of Seman 3 ciclo de carnot
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Prof. Quím. Jenny M. Fernández Vivanco
CICLO 2011-I Módulo:Unidad: Semana:
FISICO QUIMICA DE LOS PROCESOS AMBIENTALES
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Leyes de la termodinámica y el ciclo de carnot
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1. Determinar ΔHº para la reacción
CH4 (g) + 1/2 O2 (g) → CO (g) + 2 H2
(g)
a partir de los siguientes datos:
CH4 (g) + 2 O2
(g) → CO2 (g) + 2 H2O (g) ΔHº = -802
kJ
CH4 (g) + CO2
(g) → 2 CO (g) + 2 H2 (g) ΔHº = +247 kJ
CH4 (g) + H2O (g) → CO (g) + 3 H2
(g) ΔH = +206 kJ
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2. Calcula la entalpía de formación del óxido de zinc con los siguientes datos:a) H2SO4 + Zn ZnSO4 + 80,1 Kcal b) O2 + 2 H2 2 H2O + 136,6 Kcalc) H2SO4 + ZnO ZnSO4 + H2O + 50,52 Kcal. Expresa el valor obtenido en KJ/mol.
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¿Para cuál de las siguientes sustancias ΔHfº = 0 a 25ºC? a)Br2
(g) b)N (g) c)C(g) d)Ne (g) e) C (s, diamante) f) CO (g) g) Cl2 (g)
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Dadas las ecuaciones termoquímicas siguientes: 2 H2
(g) + O2 (g) → 2 H2O (l) ΔHº = -571.6 kJ
N2O5 (g) + H2O (l) → 2 HNO3
(l) ΔHº = -73.7 kJ 1/2 N2 (g) + 3/2 O2
(g) + 1/2 H2 (g) → HNO3 (l) ΔHº = -174.1 kJ
calcular la entalpía estándar de formación del pentóxido de di nitrógeno.
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El tetracloruro de carbono es un importante disolvente comercial que se prepara mediante la reacción entre el cloro gas y un compuesto del carbono. Determinar ΔHº para la reacción CS2
(l) + 3 Cl2 (g) → CCl4 (l) + S2Cl2 (l)
Para ello, seleccionar los datos adecuados de entre los que se dan a continuación: CS2
(l) + 3 O2 (g) → CO2
(g) + 2 SO2 (g) ΔHº = -1077 kJ
2 S(s) + Cl2 (g) → S2Cl2 (l) ΔHº = -58.2 kJ
C (s) + 2 Cl2 (g) → CCl4 (l) ΔHº = -135.4 kJ S (s) + O2
(g) → SO2 (g) ΔHº = -296.8 kJ
SO2 (g) + Cl2 (g) → SO2Cl2 (l) ΔHº = +97.3 kJ
C (s) + O2 (g) → CO2 (g) ΔHº = -393.5 kJ CCl4 (l) + O2
(g) → COCl2 (g) + Cl2O (g) ΔHº = -5.2 kJ
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EVALUAR UN PROCESO SI ES ESPONTANEO O NO
1.Una cascada de agua cae y nunca sube espontáneamente2.Un cubito de azúcar se disuelve en forma espontanea en una taza de café y el azúcar disuelto nunca reaparece espontáneamente en su forma original.3.El agua se congela de modo espontaneo aba de 0ºC y el hielo se funde arriba de ºOC ( a 1atm.)4.Un trozo de sodio metálico reacciona violentamente con agua para formar hidrogeno con el hidróxido de sodio para formar agua y sodio.5.El Hierro expuesto al gua y al oxigeno forma herrumbre y esta nunca retorna espontáneamente a hierro.
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2Prob.1Prob.
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2Prob.
Cv (Al) = 1,3cal/mol
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GRACIAS