Question

If the pressure of O2 in a 1.0-L container at 20 degrees Celsius is 0.37 atm, what will be the pressure on the container if 0.10 mol CO2 is added to it?

Answer 1

Calculation of pressure exerted by CO₂ :

We know that PV = nRT

Where

T = Temperature = 20 ^oC = 20+273 = 293K

P = pressure = ?

n = No . of moles = 0.10 mol

R = gas constant = 0.0821 L atm / mol - K

V= Volume of the container = 1.0 L

Plug the values we get P = (nRT) / V

                                      = ( 0.10 x 0.0821x293) / 1.0

                                      = 2.40 atm

Given the pressure exerted by O₂ is 0.37 atm

Therefore the total pressure , P = pressure excerted by CO₂ + Pressure exerted by O₂

                                               = 2.40 + 0.37 atm

                                               = 2.77 atm