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#### Concept explainers

An ice-cube tray containing 250 mL of freshwater at 15°C is placed in a freezer at −5°C. Determine the change in internal energy (kJ) and entropy (kJ/K) of the water when it has frozen.

The change in internal energy and entropy of the water.

### Explanation of Solution

**Given:**

The volume of the water

The temperature of the water

The temperature of the freezer

**Calculation:**

Consider the density of the water

Calculate the change in entropy

Thus, the change in entropy is

Calculate the change in internal energy

Thus, the change in internal energy is

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# Chapter 4 Solutions

Fox and McDonald's Introduction to Fluid Mechanics

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