7. If the specific latent heat ofice is 340 000 J/kg and the specific latent heat of steam is
2 300 000 J/kg, calculate
a) the energy needed to melt 2 kg ofice at 04
b) the energy needed to melt 500 g of ice al
0 °C
c) the energy needed to boil 3 kg of water a
100 °C
d) the energy needed to boil 100 g of water a
100 °C.