Entropy Change: 12.8g Ice Cube & 18.1g Water Evaporation

[tigers4]

Homework Statement

a.) What is the entropy change of a 12.8 g ice cube that melts completely in a bucket of water whose temperature is just above the freezing point of water?

b.) What is the entropy change of a 18.1 g spoonful of water that evaporates completely on a hot plate whose temperature is slightly above the boiling point of water

Homework Equations

deltaS=Q/T
Q=nCv$$\DeltaT$$

The Attempt at a Solution

deltaS=m*c*ln(Tf/Ti) but i don't know what Tf or Ti should be

 

[Adrmay]

. i tried to look for the answer but the only thing i can find is deltaH which i don't think will help.