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7

\( 84.5-\mathrm{g} \) ice cube is initially at \( 0.0^{\circ} \mathrm{C} \). (a) Find the change in entropy of the cube after it melts completely at \( 0.0^{\circ} \mathrm{C} \). Hint: The latent heat of fusion for water is \( 3.33 \times 10^{5} \mathrm{~J} / \mathrm{kg} \). \[ \mathrm{J} / \mathrm{K} \] (b) What is the change in entropy of the environment in this process? \[ \mathrm{J} / \mathrm{K} \]