Answer to Question #142263 in Molecular Physics | Thermodynamics for Victor Muwadia

Question

Calculate the total amount of energy required to raise the temperature of 30g of ice from -8°C to 75°C.
Specific heat capacity for Ice = 2.1J/g°C
Latent heat of fusion of Ice = 335J/g
Specific heat capacity for Water = 4.2J/g°C

Answer 1

$Q_1 = 8\times 30 \times 2.1 = 504 \;J$ (from -8 °C to 0 °C)

$Q_2 = 75 \times 30 \times 4.2 = 9450 \;J$ (from 0 °C to 75 °C)

$Q_3 = 30 \times 335 = 10050 \;J$ (heat of melting)

Total heat $Q_T = 504 + 9450 + 10050 = 20004 \;J$

Answer: 20004 J