[ISuckAtThis]

A different rigid 5.00 L cylinder contains 0.176 mole of NO(g) at 298K. A 0.176 mole of O2(g) is added to the cylinder, where a reaction occurs to produce NO2(g). What's the total pressure in the cylinder after the reaction is complete?

I have no idea where to start. Can someone help me?

[Borek]

Calculate number of moles of gas (or gases) after the reaction is complete, after that it is just a matter of using pV=nRT.