Calculate the energy of an electron in the highest occupied molecular orbital. assume the porphyrin ring is modeled as a square box for which l=1nm.

6–55 refrigerant-134a enters the condenser of a residential heat pump at 800 kpa and 358c at a rate of 0.018 kg/s and leaves at 800 kpa as a saturated liquid. if the compressor consumes 1.2 kw of power, determine (a) the cop of the heat pump and (b) the rate of heat absorption from the outside air.

If steel is more dense that lake water, why can a boat float

Explain why electric current cannot exist if a current doesn't have a voltage source.