Whenever a gas is in contact with water, some of the water vaporizes into the ga

Question

Whenever a gas is in contact with water, some of the water vaporizes into the gas. The water vapor that mixes with the gas contributes a pressure called the vapor pressure. The vapor pressure only depends on the water temperature and can be looked up in a data table. For example, the vapor pressure of water at 30 degree C is 31.86 mmHg. A common example of this is when a gas is formed in a reaction and it is collected by bubbling through water. Some of the water vaporizes into the bubbles and this gaseous mixture is collected into an inverted container to determine the yield of the reaction. The hydrogen gas formed in a chemical reaction is collected over water at 30.0 degree C at a total pressure of 734 mm Hg. What is the partial pressure of the hydrogen gas collected in this way?

Explanation / Answer

vapor pressure of water at 30 c = 31.86 mmhg

Total pressure at 30 C = 734 mmhg

vapor pressure of H2 gas = 734 - 31.86 = 702.14 mmhg

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