A sample of potassium chlorate us heated and decomposes to produce 229mL O2 gas, which was collected over water at 20 Celsius at a total pressure of 754 Torr. What is the partial pressure of O2 gas, if the partial pressure of water at 20 Celsius is 17 Torr
To find the partial pressure of O2 gas, we need to subtract the partial pressure of water vapor from the total pressure.
Step 1: Convert the temperature from Celsius to Kelvin.
To convert Celsius to Kelvin, we add 273 to the Celsius temperature.
20 Celsius + 273 = 293 Kelvin.
Step 2: Calculate the partial pressure of water vapor at 293 Kelvin using the vapor pressure table.
The vapor pressure of water at 20 Celsius is 17 Torr.
Since the temperature is the same, we can use this value directly.
Step 3: Subtract the partial pressure of water vapor from the total pressure to find the partial pressure of O2 gas.
Partial pressure of O2 gas = Total pressure - Partial pressure of water vapor
Partial pressure of O2 gas = 754 Torr - 17 Torr = 737 Torr.
Therefore, the partial pressure of O2 gas is 737 Torr.
Smoke and mirrors.
pO2 + pH2O = Ptotal = 754 torr