A flask of volume 1.00 L contains nitrogen gas at a temperature of 15 C and a

Question:

A flask of volume 1.00 L contains nitrogen gas at a temperature of 15 °C and a pressure of 0.50 bar. 0.10 mol O₂ (g) is added to the flask and allowed to mix. Then a stopcock is opened to allow 0.020 mol of molecules to escape. What is the partial pressure of oxygen in the final mixture?

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