What is the change in entropy when 15.0 g of water at 100C are ...

[Cooldude101]

What is the change in entropy when 15.0 g of water at 100C are turned into steam at 100C? The latent heat of vaporization of water is 22.6  105 J/kg.
 
  A) 90.8 J/K
  B) -90.8 J/K
  C) 339 J/K
  D) -339 J/K
  E) 0 J/K

Question 2

A thermodynamic pump absorbs thermal energy from the atmosphere at a rate of 30 kW. If work is being done to run this thermodynamic pump at a rate of 7.7 kW, what is the coefficient of performance (COP) of the thermodynamic pump?
 
  A) 3.9
  B) 4.9
  C) 2.9
  D) 0.26
  E) 22

[abro1885]

Answer to Question 1

A

Answer to Question 2

B