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Question: what mass of ice would it take to lower the...

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What mass of ice would it take to lower the temperature of 0.5kg of water from 20°C to 0°C. 7. A 100-g piece of iron is heated to 100°C and then dropped into a cavity in a large block of ice at 0°C. How much mass of ice will melt? 8. 50 grams of hot water at 80°C is poured into a cavity in a very large block of ice at 0°C. The final temperature of the water in the cavity is then O°C. Show that the mass of ice that melts is 50 grams. 9. 10. Before the invention of refrigerators, people used ice boxes to keep food cool. How much heat would a 50 kg block of ice remove from food in an ice box by the time the ice was completely melted? 11. In question 10, did all the heat absorbed by the ice come from the food? What other substances transfer heat to the ice? 12. The heat of vaporization of ethyl alcohol is about 8.46 x 205 J/kg. Show that if 2 kg of this refrigerant were allowed to vaporize in a refrigerator, it could freeze 5kg of 0°C water to ice.
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