Author Question: The reason that we can calculate the change in entropy of a system is that a. entropy always ... (Read 129 times)

penza · **on:** Jul 28, 2018

The reason that we can calculate the change in entropy of a system is that
a. entropy always decreases.
b. entropy always increases.
c. the entropy of the universe always remains constant.
d. it depends only on the properties of the initial and final equilibrium states.
e. systems always follow reversible paths.

Question 2

100 grams of molten lead (600C) is used to make musket balls. If the lead shot is allowed to cool to room temperature (21C), what is the change in entropy (in J/K) of the lead? (For the specific heat of molten and solid lead use 1.29 J/gC; the latent heat of fusion and the melting point of lead are 2.45 104 J/kg and 327C.)
a. -145
b. -252
c. -302
d. -429
e. -100