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Thermodynamics

Thermodynamics. Day 5 of 9. Heat Curve for H 2 O. °. Gold has a heat of fusion of 6.30 x 10 4 J/kg. How much heat must be removed from 3.40 kg of molten gold (AKA liquid gold) at its freezing point to turn it into solid gold at the same temperature?.

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Thermodynamics

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  1. Thermodynamics Day 5 of 9

  2. Heat Curve for H2O °

  3. Gold has a heat of fusion of 6.30 x 104 J/kg. How much heat must be removed from 3.40 kg of molten gold (AKA liquid gold) at its freezing point to turn it into solid gold at the same temperature?

  4. A 10.0 kg block of ice has a temperature of -10.0°C. The block absorbs 4.11 x 106 J of heat. What is the final temperature of the liquid water? • Specific heat of ice: 2060 J/kg·°C • Specific heat of water: 4180 J/kg·°C • Specific heat of steam: 2020 J/kg·°C • Heat of fusion for water: 3.34 x 105 J/kg • Heat of vaporization for water: 2.26 x 106 J/kg

  5. How much heat is absorbed by 1.00x102 grams of ice at -20.0°C to become water at 0.0°C? • Specific heat of ice: 2060 J/kg·°C • Specific heat of water: 4180 J/kg·°C • Specific heat of steam: 2020 J/kg·°C • Heat of fusion for water: 3.34 x 105 J/kg • Heat of vaporization for water: 2.26 x 106 J/kg

  6. A 2.00x102 gram sample of water at 60.0°C is heated to steam at 140.0°C. How much heat is absorbed? • Specific heat of ice: 2060 J/kg·°C • Specific heat of water: 4180 J/kg·°C • Specific heat of steam: 2020 J/kg·°C • Heat of fusion for water: 3.34 x 105 J/kg • Heat of vaporization for water: 2.26 x 106 J/kg

  7. How much heat is needed to change 0.300 kg of ice at -30.0°C to steam at 130.0°C? • Specific heat of ice: 2060 J/kg·°C • Specific heat of water: 4180 J/kg·°C • Specific heat of steam: 2020 J/kg·°C • Heat of fusion for water: 3.34 x 105 J/kg • Heat of vaporization for water: 2.26 x 106 J/kg

  8. Homework Problem 1 • A 175 gram lump of molten lead at its melting point, 327°C, is dropped into 55 grams of water at 20.0°C. a. What is the temperature of the water when the lead becomes solid? b. When the lead and water are in thermal equilibrium, what is the temperature? • Specific heat of lead: 130 J/kg·°C • Heat of fusion for lead: 2.04 x 104 J/kg • Heat of vaporization for lead: 8.64 x 105 J/kg

  9. Homework Problem 2 • A 0.25 kg brass block at 75.0°C is placed in a plastic foam cup containing 0.20 kg of water at 25.0°C. No heat is lost to the cup or the surroundings. Find the final temperature of the mixture. • Specific Heat of water = 4180 J/kg•K • Specific Heat of brass = 376 J/kg•K

  10. Homework Problem 3 • Heat is extracted from a certain quantity of steam at 100.0°C. As a result, the steam changes into ice at 0.0°C. If this energy were used to accelerate the ice from rest, what would be the linear speed of the ice? For comparison, bullet speeds of about 700 m/s are common.

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