Thermodynamics

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Thermodynamics - PowerPoint PPT Presentation

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

Day 5 of 9

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?

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

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

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

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
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
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
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.