AT= 80.0°C, Q = 800 g 11. Water, m = Lead, m = 475 kg, AT = 245°C, Q = How many Btu of heat must be added to 1200 lb of copper to raise its tempera- ture from 100°F to 450°F? J 12. 13. How many Btu of heat are given off by 500 lb of aluminum when it cools from 650°F to 75°F? 14 How many kcal of heat must be added to 1250 kg of copper to raise its tempera- ture from 25°C to 275°C? 15. How many joules of heat are absorbed by an electric freezer in lowering the temperature of 1850 g of water from 80.0°C to 10.0°C? How many joules of heat are required to raise the temperature of 750 kg of 16. 17. water from 15.0°C to 75.0°C? How many kilocalories of heat must be added to 750 kg of steel to raise its tem- perature from 75°C to 300°C? How many joules of heat are given off when 125 kg of steel cools from 1425°C 18 19. to 82°C? 525 kg steam boiler is made of steel and contains 315 kg of water at 40.0°C. kilo-

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