Now, open the stopcock and allow the system to mix together and come to equilibr

Question

Now, open the stopcock and allow the system to mix together and come to equilibrium. Answer the following questions using the information given above. How many moles of O_2 gas and N_2 gas are present in the combined system (i.e., both sides of the flask)? How many total moles of gas are present? What is the total volume of the flask? Calculate the total pressure of O_2 gas in the combined system. Calculate the mole fraction of Oz gas present in the system. Calculate the total pressure of gas in the system.

Explanation / Answer

a) Moles of oxygen = 0.0750, moles of nitrogen= 0.0250, total moles= 0.0750+0.0250=0.1moles

Mole fraction of oxygen= 0.0750/0.1 =0.75

b)total volume = 650+650= 1300ml =1.3 L

c) Total pressure, P = nRT/V= 0.1*0.0821*(20+273.15)/1.3=1.85 atm

d) partial pressure of oxygen = moles fraction of oxygen* Total pressure =1.85* (0.0750/0.1)=1.3875 atm

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