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The density of a gas under NORMAL conditions (STP, 273K and 1atm) is 2.4 grams/Liter. There...

The density of a gas under NORMAL conditions (STP, 273K and 1atm) is 2.4 grams/Liter. There is an ideal gas inside a 20L volume container at a temp of 5 degrees celcius. The gas is allowed to leave the container, causing the pressure inside to decrease by 0.85 atm. (the temperature inside remains constant). What is the mass of the gas that is released?

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