Refrigerant-134a at 700 kpa, 70°c, and 8.6 kg/min is cooled by water in a condenser until it exists as a saturated liquid at the same pressure. the cooling water enters the condenser at 300 kpa and 15°c and leaves at 25°c at the same pressure. determine the mass flow rate of the cooling water required to cool the refrigerant. the enthalpies of r-134a at the inlet and exit states are 308.34 kj/kg and 88.82 kj/kg. the enthalpies of compressed water at both states are 62.98 kj/kg and 104.83 kj/kg.

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.

56 moles of   lieter in chemistry

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.

1 is the answer to this problem