Here is a recipe for making synthetic Lake Tahoe water. Assuming that all of the salts dissociate into their respective ions (i. e., you get Ca2 , SO42-, K , Cl-, Mg2 , Na , and HCO3-), calculate the mole fraction of sulfation the final mixture. SaltMass added (grams per 5 gallons)CaSO40.516KCl 0.0095MgSO41.057NaHCO3(baking soda) 0.36Solve this problem using the approximation that all the ion molar concentrations are negligibly small compared to water. (Notethat there are two sources of SO42-.)

Fluids at rest possess no flow energy. a)- true b)- false

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Asimple rankine cycle uses water as the working fluid. the water enters the turbine at 10 mpa and 480c while the condenser operates at 6 kpa. if the turbine has an isentropic efficiency of 80 percent while the pump has an isentropic efficiency of 70 percent determine the thermal efficiency