Final answer:
The partial pressure of oxygen gas, when collected over water at a temperature of 22°C and a total pressure of 754 mmHg with water vapor at 19.8 mmHg, is calculated to be 734.2 mmHg.
Step-by-step explanation:
The student has asked how to calculate the partial pressure of oxygen gas collected over water. To find the partial pressure of oxygen, subtract the vapor pressure of water from the total pressure of the gas mixture. Since the total pressure is given as 754 mmHg and the water vapor pressure at 22°C is 19.8 mmHg, we can use the formula:
Partial Pressure of Oxygen = Total Pressure - Vapor Pressure of Water
Partial Pressure of Oxygen = 754 mmHg - 19.8 mmHg = 734.2 mmHg
Therefore, the partial pressure of the collected oxygen is 734.2 mmHg.