Question

The specific heat capacity of ice is about 0.5 cal/g °C. Calculate the number of calories it would take to change a 4 gram ice cube at absolute zero (-273°C) to 4 gram of boiling water.

Answer 1

add the heats:

heat to warm ice to zero
heat to melt ice at zero
heat to warm melted ice from zero to 100.
That puts it to 100. any heat after that starts boiling.