A sample of gas occupies a volume of 50.0 millilters in a cylinder with a movable piston. The pressure of the sample is 0.00 atmosphere and the temperature is 200 K. What is the volume of the sample at STP?
You will have to repost this question.........
How many atmospheres does the gas exert? You have it under no pressure, but it still occupies a volume.
Eventually you will use the relationship: