Question: how much thermal energy is needed to change 100g of ice at?
Answer: The specific heat capacity of ice is 2.108 kJ/kgK, or 2.108 J/gK. So to heat 100g of ice by 20.2K takes 2.108*100*20.2 J = 4,258.16 J. The specific heat of melting of ice is 334 J/g, so melting 100g of ice will take 33,400 J.