Ideal Gas Law: What is P? [closed]








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I know P is the pressure, but is it the outside pressure or inside pressure? I know that in equilibrium, it doesn't matter, but then in this problem I got confused:


193 mL of O2 was collected over water on a day when the atmospheric pressure was 762 mmHg. The temperature of the water was 23.0 o C. How many grams of oxygen were collected? 


How would you do that?


