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A tank containing compressed air is initially at 34.8 atmospheres. After some air is removed from...

A tank containing compressed air is initially at 34.8 atmospheres. After some air is removed from the tank, the pressure has decreased to 4.9 atm. What fraction of the original air remains in the tank? Pressures are gauge pressures. The volume of the tank is constant; assume the temperature stays constant also.

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