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Predicting Entropy Change

Predicting Entropy Change

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Positive Entropy Change
More Disorder

Less Order

A salt dissolves in water

melting

vaporization

2 moles ammonia form 2 moles nitrogen gas and 3 moles hydrogen gas

thermodynamically Favored

Negative Entropy Change
Less Disorder

More Order

A solid precipitates from solution

freezing

condensation

2 moles hydrogen gas and 1 mole oxygen gas form 2 moles water

Not Thermodynamically Favored