For which of the following salts is there a positive entropy change for dissolution in water?...
For which of the following salts is there a positive entropy change for dissolution in water?
| NH4NO3 | SrCO3 | |
| S⁰ (s) (J/mol⋅K) | 151.1 | 97.1 |
| S⁰ (aq) (J/mol⋅K) | 259.8 | -85.7 |
Group of answer choices
Neither NH4NO3 nor SrCO3
Both NH4NO3 and SrCO3
NH4NO3
SrCO3
Homework Answers
NH4NO3:
entropy change = S⁰ (aq) - S⁰ (s) = (259.8 - 151.1) = 108.7 J/mol-K (positive)
SrCO3:
entropy change = S⁰ (aq) - S⁰ (s) = (- 85.7 - 97.1) = - 182.8 J / mole-K (negative)
answer is NH4NO3
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