Hydrogen gas produced by the reaction of zinc and hydrochloric acid was collected over water at 25 degrees Celsius. Barometric pressure is 742.5 mm Hg. What is the pressure of dry hydrogen gas if the vapor pressure of water at 25 degrees Celsius is 23.8 mm Hg?
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Expert's answer
2016-04-19T10:27:05-0400
When you collect a gas like H2 over H2O, the total pressure is due to the H2 plus a small amount of H2O vapor. So P H2(dry) = P total - P H2O = 742.5 mmHg - 23.8 mmHg = 718,7 mmHg or 718.7mmHg×(1atm/760atm)=0.945atm
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