a gas is collected over water at a certain temperature. The total pressure is 756 torr. The vapor pressure of water at this temperature is 17torr. The partial pressure of the gas collected is what?
To find the partial pressure of the gas collected, we need to subtract the vapor pressure of water from the total pressure.
Given:
Total pressure (Ptotal) = 756 torr
Vapor pressure of water (Pwater) = 17 torr
Partial pressure of the gas collected (Pgas) = ?
To determine the partial pressure of the gas, we use Dalton's Law of Partial Pressures, which states that the total pressure is equal to the sum of the partial pressures of each gas present. Mathematically, it is written as:
Ptotal = Pgas + Pwater
Rearranging the equation, we have:
Pgas = Ptotal - Pwater
Substituting the given values:
Pgas = 756 torr - 17 torr
Pgas = 739 torr
Therefore, the partial pressure of the gas collected is 739 torr.