Question

A sample of nitrogen gas was collected via water displacement. Since the nitrogen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 21 °C is 1.07 atm, what is the partial pressure of nitrogen? The vapor pressure of water at 21 °C is 18.7 mm Hg.

Answer 1

To calculate the partial pressure of nitrogen in the mixture, we need to subtract the vapor pressure of water from the total pressure of the mixture.

First, convert the vapor pressure of water from mm Hg to atm:

18.7 mm Hg * 1 atm / 760 mm Hg = 0.0247 atm

Next, subtract the vapor pressure of water from the total pressure of the mixture:

1.07 atm - 0.0247 atm = 1.0453 atm

So, the partial pressure of nitrogen in the mixture at 21 °C is 1.0453 atm.