[petstar21]

NO reacts with molecular oxygen:
2 NO(g) + O2(g)  2 NO2(g)

Initially NO and O2 are separated as shown below. When the valve is opened, the reaction quickly goes to completion. Determine what gases remain at the end and calculate their partial pressures. Assume that the temperature remains constant at 25°C.

*NO is at 4L at .5atm
*O2 is at 2L and 1 atm

How do I get the partial press. of NO?
thanks

PNO
??
PO2
.1663 atm
PNO2
.3331

[Dan]

I think you need to calculate the total pressure of the system (after the valve is opened), then use Dalton's law to calculate the unknown partial pressure.