Explanation Given information: Initial temperature = 80 ∘ C . Final temperature = 110 ∘ C . Δ H ( v a p o r i s a t i o n ) = 40.7 × 10 3 J / m o l . The heat capacity of water = 75.3 J / ( m o l K ) . The heat capacity of water vapor = 25.0 J / ( m o l K ) . The heat change required to raise the temperature of water from 80 ∘ C t o 100 ∘ C is calculated using q = m ( C w ) Δ T where m = Mass of water (g) = 18 g (1 mole). C w = heat capacity of water = 4.2 J/g/ ° C Δ T = change in temperature = ( 110 – 80 ) ∘ C = 20 ∘ C Thus, q = m ( C w ) Δ T = 18 × 4.2 × 30 = 1512 J = 1.512 kJ The heat needed to vaporize the water is determined using H 2 O ( l ) → H 2 O ( g ) ( 100 ∘ C ) Δ H ( v ) = q = 40.67 kJ The heat change needed to raise the temperature of vaporized water from 100 ∘ C t o 110 ∘ C requires the same equation as used before, but using a different heat capacity

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Chapter 6, Problem 128E

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To determine: q,w,ΔE, and ΔH for change in state of water.

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Chapter 6, Problem 127E

Chapter 6, Problem 129E

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Chapter 6 Solutions

Masteringchemistry With Pearson Etext -- Valuepack Access Card -- For Principles Of Chemistry: A Molecular Approach

Ch. 6 - Prob. 1SAQ Ch. 6 - Q2. Which sample is most likely to undergo the...Ch. 6 - Prob. 3SAQ Ch. 6 - Q4. A 12.5-g sample of granite initially at 82.0...Ch. 6 - Q5. A cylinder with a moving piston expands from...Ch. 6 - Q6. When a 3.80-g sample of liquid octane (C8H18)...Ch. 6 - Q7. Hydrogen gas reacts with oxygen to form...Ch. 6 - Prob. 8SAQ Ch. 6 - Prob. 9SAQ Ch. 6 - Prob. 10SAQ

Ch. 6 - Prob. 11SAQ Ch. 6 - Prob. 12SAQ Ch. 6 - Prob. 13SAQ Ch. 6 - Prob. 14SAQ Ch. 6 - Q15. Natural gas burns in air to form carbon...Ch. 6 - 1. What is thermochemistry? Why is it important? Ch. 6 - 2. What is energy? What is work? List some...Ch. 6 - Prob. 3E Ch. 6 - 4. State the law of conservation of energy. How...Ch. 6 - Prob. 5E Ch. 6 - 6. State the first law of thermodynamics. What are...Ch. 6 - Prob. 7E Ch. 6 - 8. What is a state function? List some examples of...Ch. 6 - 9. What is internal energy? Is internal energy a...Ch. 6 - 10. If energy flows out of a chemical system and...Ch. 6 - 11. If the internal energy of the products of a...Ch. 6 - 12. What is heat? Explain the difference between...Ch. 6 - 13. How is the change in internal energy of a...Ch. 6 - 14. Explain how the sum of heat and work can be a...Ch. 6 - 15. What is heat capacity? Explain the difference...Ch. 6 - 16. Explain how the high specific heat capacity of...Ch. 6 - 17. 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