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shadowsnake
28.07.2020 •
Chemistry
Un globo lleno de helio tenia un volumen de 8.5 L en el suelo a 20°C y a una presión de 750 torr. Cuando se le soltó, el globo se elevo a una altitud donde la temperatura era de -20°C y la presión de 425 torr, ¿Cuál era el volumen del gas del globo en estas condiciones?
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Ответ:
El volumen del gas era 12.95 L
Explanation:
Se relaciona la presión y el volumen mediante la ley de Boyle, que dice:
“El volumen ocupado por una determinada masa gaseosa a temperatura constante, es inversamente proporcional a la presión”
La ley de Boyle se expresa matemáticamente como: P*V=k
Por otro lado, la Ley de Charles consiste en la relación que existe entre el volumen y la temperatura absoluta de una cierta cantidad de gas ideal, el cual se mantiene a una presión constante. Esta ley dice que cuando la cantidad de gas y de presión se mantienen constantes, el cociente que existe entre el volumen y la temperatura siempre tendrán el mismo valor:
Por último, la Ley de Gay Lussac dice que la temperatura absoluta y la presión son directamente proporcionales. Es decir, cuando se mantiene todo lo demás constante, mientras suba la temperatura de un gas subirá también su presión. Y mientras la temperatura del gas baje, lo mismo ocurrirá con la presión:
Combinado las mencionadas tres leyes se obtiene:
Cuando se desean estudiar dos diferentes estados, uno inicial y una final de un gas, se puede aplicar:
Recordando que la temperatura debe usarse en grados Kelvin, conoces los siguientes datos:
P1: 750 torrV1: 8.5 LT1: 20°C= 293°K (siendo 0°C=273°K)P2: 425 torrV2: ?T2: -20°C= 253 °KReemplazando:
Resolviendo:
V2= 12.95 L
El volumen del gas era 12.95 L
Ответ:
Adaptation is the unique character that helps plants and animals to survive in a particular region or climate. There are many plants that exists in a particular area where it can adapt itself with the climatic condition of that particular area. They can adapt themselves in cold regions. They change their physical structure like making their leaves to face all different directions so that they can do photosynthesis process even during colder temperature.
For example: Paintbrushes and Sagebrush.
Some other examples includes adaptation of aquatic plants in water. Since they all live in water they have benefits of conserving energy by preventing the growth of extensive root system. Since water is plenty and easily available for them, they are not in need of saving them for future. Pollination is an issue for them, and so most of the plants like lilies have their flowers above the water level.