Question

What is the amount of water steam in 100c required to convert 100g of ice to water at 0C

Answer 1

Your post is not clearly stated. I THINK you're asking for the amount of steam at 100 C required to melt 100 g ice at 0 degrees C.

heat fusion of ice = 333 J/g or 333 x 100 g = 33,300 J needed to melt the ice. You should use the heat of fusion value found in your text or notes.
In steam, the heat of condensation = 2260 J/g. So,
2260 J/g of steam x # g steam = 33,300 J.
Solve for # g steam needed. You should use the heat of vaporization(heat of condensation in this case) value found in your notes or in your text. Post your work if you get stuck.