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A.1 It is cold outside and you watch snow falling into a pot of liquid water, you estimate it has about a pint of water (0.5kg). When you start watching when the water in the pot is at 0°C and completely liquid. At certain point the water begins to freeze. How much ice (total) is in the glass at the moment it freezes completely? Draw the three-phase diagram and the energy interaction diagram for this process, mark initial and final state. Assume falling snow is at -15°C and it is made of ice crystals. Assume the pot is insulated from the ambient air. A.2 Assume now (more realistically) that the pot is losing energy to ambient air at 0.2kJoules per second. In 10 minutes you see the water freezes completely. What is the mass of the ice now? Draw the energy interaction diagram for this process. Is this system open or closed?

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15 5 333.33 k าท่ : 5-33 3 4.18 6 666-1852 caleres on: 9155.598 9hamd

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