The latent heat of vaporization of liquid nitrogen is about 200. kJ/kg. Suppose you have 1.00 kg of liquid nitrogen boiling at 77.0 K. If you supply heat at a constant rate of 10.0 W via an electric heater immersed in the liquid nitrogen, how long will it take to vaporize all of it? What is the time for 1.00 kg of liquid helium, whose heat of vaporization is 20.9 kJ/kg?
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