Calculating Change in Entropy for Water Vaporization at 100oC

[Cranford803]

Homework Statement

The latent heat of vaporization for water is 540 kcal/kg. By how much does the entropy of 50g of water at 100oC change if the water is very slowly converted into steam at 100oC?

Homework Equations

The Attempt at a Solution

would it be 0 heat change plus the 540? = 540 total?

 

[AtticusFinch]

No, it's not zero heat change. Certainly some heat enters the water to make it steam. How would you use the latent heat of vaporization to find out how much?