13. 50g of ice at -10°C is heated until it completely changes to steam at 100°C. Calculate the total amount of heat energy required for this process. (Specific heat capacity of ice = 2.1 J/g°C, specific heat capacity of water = 4.2 J/g°C, latent heat of fusion of ice = 334 J/g, latent heat of vaporization of water = 2260 J/g).