1. The problem statement, all variables and given/known data The is a piston the is massless and moves with friction A) assuming that out gas is ideal, we will get v = constant T. What are your variables in this case? B) If you plot V vs T on a graph, what is the slop of your graph? C) What is the number of moles for this gas? D) Using the numbers of moles and slope, determine pressure. 2. Relevant equations PV = nRT??? 3. The attempt at a solution Once again, this is from my physics TA and I have no clue how to approach it. The only thing I could think of is that he is implying that we are supposed to use PV = nRT, since then v is directly proportionate to T. I am not sure how to use this to determine the number of moles, unless I am supposed to assume 1? I guess my question is how would you approach this? I am not really sure what it is asking for.