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A barometer tube is 1 m long and 2cm^(2)...

A barometer tube is 1 m long and `2cm^(2)` in cross section. Mercury stands to a height of `75cm` in the tube. When a small amount of oxygen is introduced in the space above the mercury level, the level falls by 5cm. Calculate the mass of the oxygen is introduced. Room temperature=`27^(@)C`, g=10 m s_(-2)` and density if mercury =`13600kg m^(-3)`.

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