Subject: Determine the partial pressure of gases in reaction vessel in lab

During the lab, I was given a reaction vessel with 2 parts seperated with a 
valve. One one part there was 4 L of 0.5 atm NO and in the other part there 
was 2 L of 1.00 atm of O2. Then i had to open the valve and then theoretically 
determine which gases remain and calculate the partial pressure of each (to 
later compare with results). So i detrermined the reaction 2 NO(g) + O2(g)-->  
2 NO2(g). THen using PV=nRT i figured out the moles of NO an dO2 and found out 
the limiting reagent to be NO. Therefore i decided taht 0 moles of NO remains, 
0.04 moles of O2 is left and by the balanced equation 0.0817 moles of NO2 are 
left. I calculated the total moels to be 0.122 moles. Butthen i had difficulty 
to dtermine the toatl pressure so i can calcualte the partial pressures. Can 
you please show me how i can determine it theoretically

 

Re: Determine the partial pressure of gases in reaction vessel in lab