Question

How much energy is transferred when 225 g of water is converted from steam at 165°C to ice at –8°C?

a) 75 kJ
b) 150 kJ
c) 225 kJ
d) 300 kJ

Answer 1

To determine the energy transferred when converting water from steam to ice, calculate the energy for each step of the phase changes and temperature changes, summing them for the total energy.

Step-by-step explanation:

Calculation of Energy Transfer from Steam to Ice

To calculate the total energy transferred when 225 g of water is converted from steam at 165°C to ice at –8°C, multiple steps involving different phase changes and temperature changes are required:

1. Cooling the steam from 165°C to 100°C.
2. Condensing the steam at 100°C to water.
3. Cooling the water from 100°C to 0°C.
4. Freezing the water at 0°C to ice.
5. Cooling the ice from 0°C to –8°C.

The amount of energy transferred will be the sum of the energies required for each step. Use specific heat capacities and latent heat values for each phase change (i.e., condensation and freezing).