Air in the accompanying piston-cylinder device is in equilibrium at 200oC. If the mass of the hanging weight is 10 kg, atmospheric pressure is 100 kPa, and the piston diameter is 10 cm,
(a) Determine the pressure of air inside. Assume g = 9.81 m/s2
(b)What-if Scenario: What would the pressure be if the gas were hydrogen instead? Molar mass of air is 29 kg/kmol and that of hydrogen is 2 kg/kmol. Neglect piston mass and friction.