What is the total pressure of the gas produced in the burette if it contains nitrogen gas whose pressure is 1.5 atm, oxygen gas whose pressure is 1.6 atm and water vapour with a pressure of 1.3 atm.

Answer 1

I don't know where you have it but the sum of the partial pressure of each is the total pressure.
1.5 + 1.6 + 1.3 = ? atm.
You have a tough time getting 1.3 atm H2O vapor unless the container is sealed since the vapor pressure at boiling point is 1 atm.