PROBLEMAS DE QUMICA TERMODINAMICA 1. hallar la cantidad de calor necesario para elevar la temperatura de 100 g de cobre
desde 10 ºC a 100 ºC.
Solución
2.
suponiendo que a 100 g de aluminio a 10 ºC se le suministre la cantidad de calor necesario del ejercicio anterior deducir que cuerpo, cobre o aluminio, estará más caliente.
.
Solución
3. Un trozo de 6,22 Kg de cobre metálico se calienta dese 20,5 °C hasta 324,3 °C.
calcule el calor absorbido (en KJ) por el metal.
Solución:
CAMPOS VASQUEZ, HENRY
QUIMICA INDUSTRIAL
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4. Hallar la temperatura resultante de la mezcla de 150 g de hielo a 0ºC y 300 g de
agua a 50ºC. Solución
( ) 5. Hallar el calor que se debe extraer de 20 g de vapor de agua a 100 ºC para
condensarlo y enfriarlo hasta 20 ºC calor de vaporización 540 cal/g
Solución
6. Un calorímetro de 55 g de cobre contiene 250 g de agua a 18 ºC. Se introduce en él
75 g de una aleación a una temperatura de 100 ºC, y la temperatura resultante es de 20,4 ºC. Hallar el calor específico de la aleación.
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7. hallar la cantidad de calor necesario para elevar la temperatura de 300 g de cobre
desde 40 ºC a 100 ºC.
Solución
8. La combustión de 5 g de coque eleva la temperatura de 1 l de agua desde 10 ºC hasta
47 ºC. Hallar el poder calorífico del coque. coqu e.
Solución
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9. El agua en la parte superior de las cataratas del Niágara tiene una temperatura de 10
ºC. Si ésta cae una distancia total de 50 m y toda su energía potencial se emplea para calentar el agua, calcule la temperatura del agua en el fondo de la catarata
Solución
Si tomamos como masa del agua a
Además si
10. ¿Cuánto calor debe agregarse a 20 g de aluminio a 20 ºC para fundirlo
completamente? Calor de fusión del aluminio
; Calor específico
del aluminio 0,215 cal/g ºC; Punto de fusión del aluminio: 660 ºC
Solución
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11. Una bala de plomo de 3 g se desplaza a 240 m/s cuando se incrusta en un bloque de
hielo a 0 ºC. Si todo el calor generado funde el hielo, ¿qué cantidad de hielo se derrite? (el calor latente de fusión para el hielo es de 80 kcal/kg y el calor específico del plomo es de 0,030 kcal/kg. ºC.
Solución
12. ¿Qué energía desprenden al aire 80 g de vapor de agua que se condensan en una
ventana? En calorías Datos: Vapor Le = 2257 J/g
Solución:
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13. Una herradura de hierro de 1,5 Kg inicialmente a 600 ºC se sumerge en una cubeta
que contiene 20 Kg de agua a 25 ºC. ¿Cuál es la temperatura final?
Solución
( )] [ ( ) [ ( )] 14. A una sartén de acero de 300 g de masa se le aumenta la energía interna en 200 J: a) ¿Qué aumento de temperatura se produce? b) Si su temperatura inicial es de 25 ºC, ¿Cuál será la temperatura temperatura final? Dato: Calor específico del acero 450 J/kg·K.
Solución
a)
b)
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15. ¿Cuánto aumenta la energía interna de 500 g de agua si se aumenta su temperatura
de 50 ºC a 60 ºC? suponga volumen constante
Solución
16. Un cubito de hielo de 30 g de masa se encuentra a – a – 5 ºC. Calcula la energía que
hay que comunicar para que se pase al estado líquido. Datos: Hielo Lf = 334,4 J/g. ce = 2,13 J/g·K
Solución
Energía necesaria = energía para c ambio de fase + energía para la variación de temperatura -) Energía de variación de temperatura
-) Energía de cambio de fase
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18. Se quiere fundir 1 kg de hielo a 0 ºC echando agua a 60 ºC. ¿Qué cantidad de agua
se necesita? Datos: Hielo Lf = 334,4 J/g.
Solución
19. En un experimento se suministran 40000 J de d e energía en forma de calor y esto eleva
la temperatura de un bloque de aluminio 80 ºC. Si la masa del bloque de aluminio es de 300 g, ¿cuál es e s el valor del calor específico del aluminio? a luminio?
Solución
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Solución
21. ¿Cuánto calor hay que transferir para fundir una barra de hierro de masa 10 kg que
se encuentra a 0 ºC? Datos: Temperatura de fusión del hierro 1535 º C, Lf = 25,080 J/g, ce = 0,489 J/g·K.
Solución
22. ¿Cuánto aumenta la energía interna de 400 g de agua si se aumenta su temperatura
de 30 ºC a 80 ºC? si el sistema realiza un trabajo de 400J.
Solución
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Solución
( ) 24. En un experimento se suministran 5820 J de energía en forma de calor y esto eleva
la temperatura de un bloque de aluminio 30 ºC. Si la masa del bloque de aluminio es de 200 g, ¿cuál es el valor del calor específico del aluminio?
Solución
25. En un reactor libera
de energía en forma de calor y esto eleva la
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26. Un jugador eleva un metal de 10 kg desde el suelo hasta hasta una altura de 6 m y luego la
deja caer al suelo. ¿Qué cantidad de trabajo, en J, se realiza para levantar la bola?
Solución Como el trabajo que se realiza es igual a la energía que gana el cuerpo
27. Cierto gas se expande de un volumen de 2.5 L a 5 L a temperatura constante calcule
el trabajo realizado por el gas si la expansión ocurre: a) Contra el vacío. b) Contra de una presión constante de 1.5 atm
Solución Si
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Solución
29. Una muestra de nitrógeno gaseoso expande su volumen de 3L a 8 L a temperatura
constante calcula el trabajo realizado en J si el gas se expande contra una presión constante de 0.80 atm , y contra una presión de 3,7 atm
Solución Nos dice a presión constante si
Además en ambos es expansión
Cuando la presión es 0,80atm.
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31. calcule el cambio de energía interna cuando 2 moles de metano se queman y forman
dióxido de carbono y agua a 3 atm y 300K. en la siguiente ecuación,
Solución
32. calcule el trabajo realizado en joule cuando se evapora 3 moles de agua a 2.5 atm y
100°C. suponga que el volumen del agua líquida es despreciable comparado con el volumen del vapor a 100°C .suponga un comportamiento de gas ideal.
Solución
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34. Un trozo de plata con una masa de 362 g tiene una capacidad calorífica de 85,7 J/ °C.
¿Cuál es el calor específico de la plata?
Solución:
35. una muestra de 0.1375g de magnesio solido se quema en una bomba calorimétrica a
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36. calcule el calor de combustión de la siguiente reacción
Solución
37. Calcule el calor de combustión de la siguiente reacción
Solución
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Solución Como el trabajo que se realiza es igual a la energía que gana el cuerpo
40. Un trozo de 500 gramos de cobre que se encuentra a 200 ºC se sumerge en dos litros de
agua a 10 ºC mezclándose isobárica isobárica y adiabáticamente.
. encuentre la
entropía del cobre cuando está en equilibrio.
Solución
( ) ( )
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. 41. Un sistema absorbe 360 J de calor y realiza un trabajo de 25J. Calcular la variación
de energía interna
Solución
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44. Al quemarse la gasolina en un cilindro del motor de un coche se liberan 120 kJ. Si el
trabajo realizado por los gases producidos en la combustión es de 50 kJ, calcula cuánto valdrá la variación de energía interna del sistema Solución
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Como es una reacción de combustión su ecuación es la siguiente
∑ ∑
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Simplificando y sumando ambas ecuaciones tenemos
49. calcule el trabajo realizado cuando se disuelven de estaño en un exceso de acido 1,00atm y 25°C.
Solución
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Si despreciamos el volumen inicial ya que el volumen va a aumentar estamos en una expansión por lo que el trabajo va a ser negativo
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54. Un gas ideal inicialmente a 300 K se expande en forma isobárica a una presión de
2.5 kPa. Si el volumen aumenta de 1 m3 a 3 m3 y se agregan 12500 J de calor al sistema, encuentre:
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Calcule la entalpia de formación del metanol ( ) a partir de sus elementos.
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b.
Si un mol de pesa
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