Problem $2(20$ points$).0\mathrm{.}50$ kg of water at $100$C is heated in a big frying pan until it is all turned

into steam.

a$)(7$ points$)$ Calculate the change in entropy of the water. The latent heat of vaporization is

L v $=2$ x $106$ J$/$kg$.$

b$)(7$ points$)$ During this process the frying pan$$s temperature is assumed to remain constant

$($because it is so massive$)$ at $180$C$.$ Calculate the change in entropy of the frying pan.

c$)(6$ points$)$ What is the total change in entropy of the water$/$frying pan system? Based on this

result, is this process reversible or irreversible? Why?