posted by Grace .
2 moles of ideal gas are in a cylinder container with cross-sectional area 1*10^-2 m^3. Cylinder is fitted with a light, movable piston that is open to atmosphere, where pressure is 10^-5 PA.A 50KG MASS PLACED ON PISTON KEEPS IT IN mechanical equilibrium when temperature is 300K. When temperature is reduced to 250K, find pressure.
Are you sure about that atmospheric pressure of 10^-5 Pa? It is much closer to 10^5 Pa.
It seems to me that the the pressure inside the piston is determined by the weight per area of the piston (and the 50 kg mass above it) and the atmospheric pressure above, and will not change.