2.1 Cellophane is being used to wrap a food container to keep food moist at 38˚C. The cellophane is 3.28x10-4 ft thick, with an area of 2000 cm2. The vapour pressure of water vapour inside the container is 10 mm Hg and the air outside contains water vapour at a pressure of 5 mm Hg. The permeability of water vapour in cellophane is 1.82x10-7 liters solute (STP)/s. M2.Atm/m. 2.1.1 At steady state, calculate the flux of water vapor (kmol/s. M2)? (7) 2.1.2 Calculate the loss of water vapor in g/d at steady state?

Liquid flows at steady state at a rate of 2 lb/'s through a pump, which operates to raise the elevation of the liquid 100 ft from control volume inlet to exit. the liquid specific enthalpy at the inlet is 40.09 btu/lb and at the exit is 40.94 btub. the pump requires 3 btu/s of power to operate. if kinetic energy effects are negligible and gravitational acceleration is 32.174 tt/s, the heat transfer rate associated with this steady state process is most closely 1)-2,02 btu/s from the liquid to the surroundings 2)-3.98 btu/s from the surroundings to the liquid. 3)-4.96 btu/s from the surroundings to the liquid. 4)-1.04 btu/s from the liquid to the surroundings.