Question

The partial pressure of water at 20 oc is 18 mmhg. a sample of oxygen gas is collected over water at this same temperature. total pressure inside the vessel is determined to be 850 mmhg. calculate the partial pressure of the collected oxygen gas.

Answer 1

The partial pressure of the collected oxygen gas is 832 mmHg.

Step-by-step explanation:

When a gas is collected over water, the total pressure is equal to the sum of the partial pressure of the gas and the vapor pressure of water. In this case, the total pressure is 850 mmHg and the vapor pressure of water at 20°C is 18 mmHg. To find the partial pressure of the collected oxygen gas, subtract the vapor pressure of water from the total pressure:

Partial Pressure of Oxygen Gas = Total Pressure - Vapor Pressure of Water

Partial Pressure of Oxygen Gas = 850 mmHg - 18 mmHg

Partial Pressure of Oxygen Gas = 832 mmHg