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Hydrogen is collected over water at 22^(...

Hydrogen is collected over water at `22^(@)C` and a barometer reading of 740 mmHg. If 300 mL of hydrogen is collected, with expression will give the volume of dry hydrogen at the same temperature and pressure?
`{:("Compound","Vapour Pressure at" 22^(@)C),(H_(2)O,20 mmHg):}`

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