In a 1 L flask, 250 mL nitrogen at 720mm pressure and 380 mL of oxygen at 650 mm pressure are taken together. If temperature is kept constant, what will be the pressure of the mixture?

Explanation

Nitrogen , `V_(1) = 250 mL , P_(1) = 720 mm , V_(2) =100` mL , then
Partial pressure of oxygen , `P_(N_(2)) = (720 mm xx 250 mL)/(1000 mL) = 180` mm
Partial pressure of oxygen , `P_(O_(2)) = (650 mm xx 380 mL)/(1000 mL) = 247` mm
By Dalton.s law of partial pressure , total pressure , P = `P_(N_(2)) + P_(O_(2)) = 180 + 247 = 427` mm