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3.- Although most gases behave like ideal gases at ordinary pressures, their behavior deviates from the ideal at sufficiently high pressures or sufficiently low temperatures,

3.- Although most gases behave like ideal gases at ordinary pressures, their behavior deviates from the ideal at sufficiently high pressures or sufficiently low temperatures, that is, when the density of the gas is high and the molecules on average are not very far apart, the Van der Waals equation describes the behavior of many real gases over a wide range of pressures more accurately than the ideal gas.

Consider a 20L tank containing 300 moles of

Helium at 400 atm pressure. a) What is the value of an^2 /v^

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2 What fraction of the pressure does it represent? b) What is the value of bm and what fraction of the volume does it represent? c) What is the temperature of the helium?

3.- Aunque la mayora de los gases se comportan como gas ideal a las presiones ordinarias, su comportamiento se desva del ideal a presiones suficientemente altas o temperaturas suficientemente bajas, es decir, cuando la densidad del gas es elevada y las molculas por trmino medio no estn muy alejadas, la ecuacin de Van der Waals describe el comportamiento de muchos gases reales en un amplio margen de presiones con ms exactitud que la del gas ideal. Considere un tanque de 20L que contiene 300 moles de Helio a 400 atm de presin. a) Cul es el valor de V2an2 Qu fraccin de la presin representa? b) Cul es el valor de bm y que fraccin del volumen representa? c) Cunto vale la temperatura del helio

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