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Author Question: A gasoline engine absorbs 2500 J of heat at 250C and expels 2000 J at a temperature of 50C. What is ... (Read 133 times)

luvbio

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on: Jul 28, 2018
A gasoline engine absorbs 2500 J of heat at 250C and expels 2000 J at a temperature of 50C. What is the magnitude of the change in entropy (in J/K) for the system?
 a. 6.2
  b. 4.7
  c. 1.4
  d. 10.9
  e. 3.2

Question 2

A vessel containing 10 kg of water is left out where it evaporates. If the temperature remains constant at 20C, what is the change in entropy (in kcal/K)? (The latent heat of vaporization at 20C is 585 cal/g.)
 a. 30
  b. 10
  c. 20
  d. 40
  e. 290


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trog

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Reply #1 on: Jul 28, 2018
Answer to Question 1

c

Answer to Question 2

c


luvbio

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Reply 2 on: Jul 28, 2018
Wow, this really help

nathang24

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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