A 2.00-L sample of was collected over water at a total pressure of 750. torr and 26 °C. When the was dried (water vapor removed), the gas had a volume of 1.93 L at 26 °C and 750. torr. Calculate the vapor pressure of water at 26 °C.

Respuesta :

Answer:

The vapor pressure of water at 26 °C = 26.25 atm

Explanation:

Using Boyle's law  

[tex] {P_1}\times {V_1}={P_2}\times {V_2}[/tex]

Given ,  

V₁ = 2.00 L

V₂ = 1.93 L

P₁ = ?

P₂ = 750 torr

Using above equation as:

[tex]{P_1}\times {V_1}={P_2}\times {V_2}[/tex]

[tex]{P_1}\times {2.00}={750}\times {1.93}[/tex]

[tex]{P_1}=\frac {{750}\times {1.93}}{2.00}\ torr[/tex]

[tex]{P_1}=723.75\ torr[/tex]

Vapor pressure = Total pressure - Partial pressure of oxygen gas = 750 - 723.75 atm = 26.25 atm

The vapor pressure of water at 26 °C = 26.25 atm