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50cc of oxygen is collected in an invert...

`50cc` of oxygen is collected in an inverted gas jar over water.The atmospheric pressure is 99.4 kPa and the room tempareture is `27^(@)C.`The water level in the jar is same as the level outside . The saturation vapour pressure at`27^(@)C`is 3.4kPa. Calculate the number of moles of oxgen collected in the jar.

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