a sample of gas is collected over water at a temperature of 35 degrees celcius when the barometric pressure reading is 742.0 torr what is the partial pressure of the dry gas?
Ptotal = Pgas + PH2O.
Look up the vapor pressure of water at 35 C, Ptotal is 742, calculate Pgas.
By the way, note the correct spelling of celsius.
707
To find the partial pressure of the dry gas, we need to correct for the presence of water vapor. The vapor pressure of water at 35 degrees Celsius is 42.2 torr.
The partial pressure of the dry gas can be calculated using Dalton's Law of Partial Pressures, which states that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of each constituent gas.
Partial pressure of dry gas = Total pressure - Vapor pressure of water
Total pressure = Barometric pressure reading = 742.0 torr
Vapor pressure of water = 42.2 torr
Substituting the values into the equation:
Partial pressure of dry gas = 742.0 torr - 42.2 torr = 699.8 torr
Therefore, the partial pressure of the dry gas is 699.8 torr.
To determine the partial pressure of the dry gas, we need to consider the effect of water vapor in the collected gas sample. The partial pressure of the dry gas is the pressure that the gas would exert if the water vapor were removed completely.
To calculate the partial pressure of the dry gas, we can use Dalton's Law of Partial Pressures, which states that the total pressure of a gas mixture is equal to the sum of the partial pressures of each individual gas component.
Here are the steps to calculate the partial pressure of the dry gas:
1. Determine the vapor pressure of water at the given temperature. The vapor pressure of water increases with temperature. You can use a vapor pressure table, or use the Antoine equation for water to calculate the vapor pressure at 35 degrees Celsius. Let's assume the vapor pressure is 30.0 torr.
2. Subtract the vapor pressure of water from the measured barometric pressure. In this case, the measured barometric pressure is 742.0 torr, so subtracting the vapor pressure of water (30.0 torr) gives us:
Partial pressure of dry gas = Barometric pressure - Vapor pressure of water
Partial pressure of dry gas = 742.0 torr - 30.0 torr
Partial pressure of dry gas = 712.0 torr
Therefore, the partial pressure of the dry gas is 712.0 torr.