The pressure would be. Now suppose we filled the same container with 0. Now suppose we put both the 0. What would the pressure be? During the collection, the water level in the container will adjust so that the pressure inside and outside the container are the same.
Because of this, if we know the atmoshperic pressure, we also know the pressure of the gas inside the bottle. The pressure inside the bottle is partially from the gas being collected and partially from the water vapor that has escaped from the surface of the water in the jar.
The water inside the jar will reach an equlibruim state where the number of molecules leaving the surface is the same as the number returning. Find the volume that the dry hydrogen would occupy at STP. The sum of the pressures of the hydrogen and the water vapor is equal to the atmospheric pressure.
The pressure of the hydrogen is found by subtraction. Then, the volume of the gas at STP can be calculated by using the combined gas law. This is less than the actual collected volume because some of that is water vapor. The conversion using STP is useful for stoichiometry purposes. How many moles of oxygen gas have been collected? If the water levels inside and outside the bottle are the same, then the total pressure inside the bottle equals 1.
The mole fraction of oxygen gas in the bottle is 0. Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:. Skip to main content. Search for:.
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