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Zielflug [23.3K]
2 years ago
6

La capacidad calorífica del aluminio es de 0.9 J/g C. Determine la energía necesaria calentar un bloque de aluminio de 850 g de

22.8 grados a 94.6 grados Celcius.
Chemistry
1 answer:
Harman [31]2 years ago
4 0

Answer:

La energía necesaria para calentar el bloque de aluminio es 54927 J.

Explanation:

Se denomina calorimetría a la medición y el cálculo de las cantidades de calor que intercambia un cuerpo o un sistema.

De esta manera, entre el calor y la temperatura existe una relación de proporcionalidad directa (Dos magnitudes son directamente proporcionales cuando existe una constante de manera que cuando una de las magnitudes aumenta, la otra también; y lo mismo ocurre cuando alguna de las dos disminuye.). La constante de proporcionalidad depende de la sustancia que constituye el cuerpo como de su masa, y resulta el producto del calor específico por la masa del cuerpo. Entonces, la ecuación que permite calcular intercambios de calor es:

Q=c*m*ΔT

Donde Q es el calor intercambiado por un cuerpo de masa m, constituido por una sustancia de calor específico c y donde ΔT es la variación de temperatura.

En este caso:

  • c= 0.9 \frac{J}{g*C}
  • m= 850 g
  • ΔT= Tfinal - Tinicial= 94.6 C - 22.8 C= 71.8 C

Reemplazando:

Q= 0.9 \frac{J}{g*C}*850 g* 71.8  C

y resolviendo se obtiene:

Q= 54927 J

<u><em>La energía necesaria para calentar el bloque de aluminio es 54927 J.</em></u>

<u><em> </em></u>

<u><em></em></u>

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