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A tank with a volume of 0.05 m3 contains 02 at a pressure of 150
atmospheres and a temperature of 20 °C. a) Find the number of moles
of oxygen in the tank. b) Find the mass, in kg, of oxygen in the tank. c)
What is the value of the pressure if the temperature increases to 500
°C. d) At 20°C, how many moles of oxygen can be removed before the
pressure in the tank drops to 15 atm?

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