1. How much heat must be removed from 750 grams of water at 0°C to form ice at 0°C? 2. How much heat is necessary to vaporize 200 grams of water at 100°C to form steam at 100°C? 3. A 25.0 kg bag of dirt falls 15.0 m at a construction site. Assuming that all of the heat produced is retained by the dirt, how much will its temperature increase? (cdirt = 0.20 cal/g•°C) 4. A 1000 kg car with a speed of 90 km/h brakes to a stop. How many calories of heat are generated by the brakes as a result? 5. How much heat is needed to cause the following irreversible reaction? 250 g of liquid H2O at 60°C is heated to form 250 g of steam at 150°C 6. Calculate the amount of heat needed to increase the temperature of 200 grams of water at 10°C to 95°C. 7. How much heat must be added to 150 grams of ice at 0°C to form water at 0°C? 8. How much heat must be removed when 50 grams of steam at 100°C Is condensed to form liquid water at 100°C? 9. How much heat is absorbed by pouring 15 grams of 100°C liquid water on a student’s hand. The water is cooled to body temperature, 37°C. Assume that all of the heat is absorbed by the hand. 10. How much heat is absorbed by contacting 15 grams of 100°C steam by a student’s hand. The steam is condensed to liquid and then the liquid is cooled to body temperature, 37°C. Assume that all of the heat is absorbed by the hand.