Ley De Hess Essay

573 words - 2 pages

GIMNASIO FEMENINO AREA DE CIENCIAS NATURALES
QUÍMICA - GRADO 10º - Olga Lucía Perdomo A. TALLER Nº 2. Ley de Hess
Código
RGAF-7-09 Página 1 de 4
Actualización
08/02/2010
GIMNASIO FEMENINO - SISTEMA DE GESTIÓN DE CALIDAD - COPIA NO CONTROLADA Este documento debe ser archivado en la carpeta de cada estudiante Fecha de impresión 18/11/2013 6:01
Nombre __________________________________________________ Fecha ________________ Curso ______ Indicadores de Desempeño
• Calcular la variación en la entalpía de las reacciones aplicando la ley de Hess. Resuelva los siguientes problemas sobre cambios en la entalpía:
1. Usando las siguientes ecuaciones:
C(s) + O2(g) → CO2(g) ∆H = -390 kJ/mol Mn(s) + O2(g) → MnO2(s) ∆H = -520 kJ/mol
¿Cuál es ∆H (en kJ/mol) para la siguiente reacción?
MnO2(s) + C(s) → Mn(s) + CO2(g) A. 910
B. 130
C. -130
D. -910 (2)
2. Usando las siguientes ecuaciones:
Cu(s) + 2 1 O2(g) → CuO(s)∆Hο = -156 kJ/mol
2Cu(s) + 2 1 O2(g) → Cu2O(s)∆Hο = -170 kJ/mol
¿Cuál es el valor de ∆Hο (en kJ/mol) para la siguiente reacción?
2CuO(s) → Cu2O(s) + 2 1 O2(g)
A. 142
B. 15
C. -15
D. -142 (2)

GIMNASIO FEMENINO AREA DE CIENCIAS NATURALES
QUÍMICA - GRADO 10º - Olga Lucía Perdomo A. TALLER Nº 2. Ley de Hess
Código
RGAF-7-09 Página 2 de 4
Actualización
08/02/2010
GIMNASIO FEMENINO - SISTEMA DE GESTIÓN DE CALIDAD - COPIA NO CONTROLADA Este documento debe ser archivado en la carpeta de cada estudiante Fecha de impresión 18/11/2013 6:01
3. Considere las siguientes reacciones:
Mg(s) + 2 1 O2(g) → MgO(s) ∆Hο = -602 kJ/mol
H2(g) + 2 1 O2(g) → H2O(g) ∆Hο = -242 kJ/mol
¿Cuál es el valor de ∆Hο (en kJ/mol) para la siguiente reacción?
MgO(s) + H2(g) → Mg(s) + H2O(g)
A. -844
B. -360
C. +360
D. +844 (2)
4. Las siguientes ecuaciones muestran la oxidación del carbono y del monóxido de carbono a dióxido de carbono.
C(s) +O2(g) → CO2(g) ΔHӨ = -x kJ /mol
CO(g) + 2 1 O2(g)→ CO2(g) ΔHӨ = -y kJ /mol
¿Cuál es el cambio en la entalpía, en kJ/ mol, para la oxidación del carbono a monóxido de carbono?
C(s) + 2 1 O2(g)→ CO(g)
A. x + y
B. - x - y
C. y - x
D. x - y (2)

GIMNASIO FEMENINO AREA DE CIENCIAS NATURALES
QUÍMICA - GRADO 10º - Olga Lucía Perdomo A. TALLER Nº 2. Ley de Hess...

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