1302200J
Explanation:
To bring water at 70°C to water at 0°C, we use MC∆T.
To convert water at 0°C to ice at 0°C, ML is applicable, where L is the latent heat of fusion and M equals mass. NB: Temperature is constant during fusion.
Again, to raise the temperature of ice to -11°c, we use MC∆T.
Total heat = MCw∆T + ML + MCi∆T
2 ×4200× 70 + 2×334000 + 2× 2100× 11 = 1302200J
