density = mass/volume
volume of the ice on the car window = height*area = 0.009m*1 =
9.0*10^-3
mass = 900*9.0*10^-3 = 8.1 kg
q = m*S*DT
q = 8100*0.5*(0+12)
q = 48600
heat of fusion = mass* latent heat = 8100*80 = 648000 cal
heat required to supply is = q +latent heat of fusion
                                   Â
= 48600 + 648000
                                   Â
= 696600 cal
                                   Â
= 696.6 K cal
