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Mammals excrete excess nitrogen in the form of urea, CO(NH2)2. Urea can react with water to...

Mammals excrete excess nitrogen in the form of urea, CO(NH2)2. Urea can react with water to form carbon dioxide and ammonia, as in the following reaction.

CO(NH2)2(aq) + H2O(ℓ) ® CO2(g) + 2 NH3(g)

a. Without doing the calculation, would you expect the entropy for this reaction to be positive or negative? Why?

b. Calculate DrH° and DrS° for this reaction. DfH° = –319.2 kJ/mol; S° = 173.8 J/K•mol

c. Calculate DrG° for the reaction under standard conditions (25.0°C) using your answers from part (b). Is the reaction spontaneous or not at this temperature?

d. Determine the temperature at which the spontaneity of urea decomposition switches from spontaneous to non-spontaneous. Complete the following sentence, and show your mathematical work:

The decomposition of urea is spontaneous ABOVE/BELOW (choose one) _________°C

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gladiator answered 2 years ago
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