I have a Pressure in atm and a volume in liters

how do i find the temperature in kelvins??

I know the formula pv=nRT works...but i don't know the number of moles so... I don't know what to do.

If you don't know the number of moles, n, or the mass and gas type (which can be used to compute n), you have too many unknowns for one equation, and are out of luck.