Question

Pure N2 in a flask has a pressure of 1.0 atm. If O2 gas is added until the number of molecules of O2 is twice as that of N2. What is the total pressure of the flask

Answer 1

The total pressure of gasses (nitrogen and oxygen) in the flask is determined as 3 atm.

Balanced chemical equation of N2 and O2

The balanced chemical equation of nitrogen gas and oxygen gas is determined as follows;

N₂  + 2O₂  → 2NO₂

PV = nRT

• Pressure is directly proportional to number of moles

P(total) = P(N₂) + PO₂

P(total) = 1 atm + 2(1 atm)

P(total) = 3 atm

Thus, the total pressure of gasses (nitrogen and oxygen) in the flask is determined as 3 atm.

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