(a) Ten grams of H2 O starts as ice at 0 °C . The ice absorbs heat from the air (just above 0 °C ) until all of it melts. Calculate the entropy change of the H2 O , of the air, and of the universe. (b) Suppose that the air in part (a) is at20 °C rather than 0 °C and that the ice absorbs heat until it becomes water at 20 °C . Calculate the entropy change of the H2 O , of the air, and of the universe. (c) Is either of these processes reversible?

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