1.
How much thermal energy is required to change a 40 g40\,\text{g} ice cube from solid at −10∘C-10^\circ\text{C} to steam at 110∘C110^\circ\text{C}? [Assume, latent heat of fusion for water =80 kcal/kg= 80\,\text{kcal/kg}, specific heat of water =1 kcal/kg∘C= 1\,\text{kcal/kg}^\circ\text{C}, specific heat of ice =0.5 kcal/kg∘C= 0.5\,\text{kcal/kg}^\circ\text{C}, specific heat of steam =0.48 kcal/kg∘C= 0.48\,\text{kcal/kg}^\circ\text{C}, latent heat of vaporisation of water =540 kcal/kg= 540\,\text{kcal/kg}]