Author Question: A gasoline engine absorbs 2500 J of heat at 250C and expels 2000 J at a temperature of 50C. What is ... (Read 73 times)

luvbio · **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