Partial Pressure of O2: 99.3 KPa at 25°C & Water

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To find the partial pressure of oxygen gas collected over water at 25°C with an atmospheric pressure of 99.3 KPa, the vapor pressure of water at this temperature must be considered. At 25°C, the vapor pressure of water is approximately 3.17 kPa. Using the formula P total = P O2 + P H2O, the partial pressure of O2 can be calculated as P O2 = P total - P H2O, resulting in P O2 = 99.3 kPa - 3.17 kPa, which equals 96.13 kPa. Converting this to mmHg, the partial pressure of O2 is approximately 721 mmHg. Understanding vapor pressure is crucial for accurate calculations in gas collection scenarios.
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what is the partial pressure of oxygen gas. if it is collected over water at 25 degrees celcius and an atmospheric pressure of 99.3 KPa. answer in mmHg

okay i know the formula for partial pressures is

P total = P O2 + P H2O

but there is no other info given like the volume or anything so i am lost. please answer by tomorrow. and show all the steps. i have a quiz the day after
 
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There should be a discussion of how H20 pressure varies with temperature, either in your textbook or class lecture notes. You might try looking up "vapor pressure" or "pressure, vapor" in the index of your textbook.
 
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