![]() What is E°(cell) for the reaction 2 Au(s) + 3 Ca²+(aq) → 2 Au³+(aq) + 3 Ca(s)? E° (V) Standard Reduction Potentials 1.5 Au³+ (aq) + 3e → Au(s) Ca²+ (aq) + 2e → -2. What is K for a reaction if AG° =-77.9 kJ/mol at 25.0 ☌? (R = 8.314 J/mol Substance AG°f (kJ/mol) NO₂ (g) 51.3 N₂O4 (g) 97.8 1 4 7 +/- 2 5 8. Because the entropy of a substance depends on the amount of substance, the pressure, and the temperature, it is convenient to describe the entropy of a substance in terms of Sm, its standard molar entropy, i.e., as the entropy of 1 mol of substance at the standard pressure of 1 atm (101.3 kPa) and given temperature. pressure 1013.25 hPa and temperature 25 ☌. A) AS is (-) B) AS is (+) C) AS = 0 D) AS cannot be predicted for this reaction.ĭetermine AG for 2 NO₂(g) → N₂O4(g) at 25☌. Standard entropy of the substance refers to so-called standard conditions i.e. Cl₂ → 2Cl(g) Predict the change in entropy (AS) of this reaction. It can be decomposed to form two Cl atoms as shown below. E) Negative, because there are more moles of reactant than product.Ĭl₂ is a stable diatomic molecule. D) Negative, because there are more moles of gas on the reactant side than the product side. The entropy of a pure crystalline structure can be 0 J mol1. That is, an element in its standard state has a nonzero value of S at room temperature. ![]() Unlike standard enthalpies of formation, the value of S is an absolute. C) Positive, because it is a synthesis reaction. The standard molar entropy is usually given the symbol S, and has units of joules per mole kelvin (J mol1 K1). Question: Which of the following has the largest standard molar entropy, Sº (298. B) Positive, because there are more moles of reactant than product. Because the entropy of a substance depends on the amount of substance, the pressure, and the temperature, it is convenient to describe the entropy of a substance in terms of S m °, its standard molar entropy, i.e., as the entropy of 1 mol of substance at the standard pressure of 1 atm (101.3 kPa) and given temperature. What will the sign on AS be for the following reaction and why? 2 Mg (s) + O₂(g) → 2 MgO (s) A) Positive, because there is a solid as a product. Unlike standard enthalpies of formation, the value of S° is an absolute. If 5 has a ° (5°), then it is referred to as standard molar entropy and represents the entropy at 298K and 1 atm of pressure for solutions, it would be at a concentration of 1 molar. The standard molar entropy is usually given the symbol S°, and has units of joules per mole kelvin (J mol1 K1). Explanation: The absolute entropy at one mole of a pure. The units of entropy are commonly J K' mole'. Standard molar entropy is the absolute entropy of one mole of a pure substance at 1 atm and 25 C. Transcribed image text: Which of the following has the largest standard molar entropy, Sº (298.15 K)? A) He(g) B) H₂(g) C) NaCl(aq) D) KBr(s) E) Hg(1) The quantity of entropy of a system depends on the temperature and pressure of the system.
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