CHEM134 Week 12 Lesson 6 Quiz Score 100%
Course : American Public
Contributed : Hennah Gill
- $25.00
- Question: The second law of thermodynamics states that:
- Question: Which of these species would you expect to have the lowest standard entropy (S°)?
- Question: For the reaction 2C(graphite) + H2(g) → C2H2(g), ΔG°= +209.2 kJ/mol at 25°C. If P(H2) = 100. atm, and P(C2H2) = 0.10 atm, calculate ΔG for this reaction.
- Question: Arrange the following substances in the order of increasing entropy at 25°C:
- Question: The equilibrium constant for the reaction AgBr(s) ⇌ Ag+(aq) + Br– (aq) is the solubility product constant, Ksp = 7.7 × 10 13 at 25°C. Calculate ΔG for the reaction when [Ag+] = 1.0 × 10–2 M and [Br–] = 1.0 × 10–3 M. Is the reaction spontaneous or nonspontaneous at these concentrations?
- Question: The Boltzmann formula is S = k ln W. A perfect crystal has a molar entropy of 0 at absolute zero because
- Question: Given that ΔHvap is 54.5 kJ/mol, and the boiling point is 83.4°C, 1 atm, if one mole of this substance is vaporized at 1 atm, calculate ΔS.
- Question: Which of these species has the highest entropy (S°) at 25°C?
- Question: Nitrosyl chloride (NOCl) decomposes at elevated temperatures according to the equation 2NOCl(g) ⇌ 2NO(g) + Cl2(g) Calculate Kp for this reaction at 227°C. (ΔH° = 81.2 kJ/mol, ΔS° = 128 J/K·mol)
- Question: Calculate ΔS° at 25°C for the reduction of PbO(s), 2PbO(s) + C(s) → 2Pb(s) + CO2(g) given these absolute entropies:
- Question: Sodium reacts violently with water according to the equation: 2 Na(s) + 2 H2O(l) → 2 NaOH(aq) + H2(g) The resulting solution has a higher temperature than the water prior to the addition of sodium. What are the signs of ΔH° and ΔS° for this reaction?
- Question: Which electron on an atom of copper would have the highest value of W in the Boltzmann formula?
- Question: Which of the following is consistent with a reaction that proceeds spontaneously in the reverse direction (assume all variables are in terms of the forward direction only)?
- Question: Which of the following shows a decrease in entropy?
- Question: A two-bulbed flask contains 5 particles. What is the probability of finding all 5 particles on the left side?
- Question: For the process CHCl3(s) → CHCl3(l), ΔH° = 9.15 kJ/mol and ΔS° = 43.9 J/mol/K. What is the melting point of chloroform?
- Which of the following is consistent with a spontaneous process in the forward direction?
- Question: Determine ΔS° for the reaction:
- Question: A 100 mL sample of water is placed in a coffee cup calorimeter. When 1.0 g of an ionic solid is added, the temperature decreases from 21.5°C to 20.8°C as the solid dissolves. For the dissolving of the solid:
- Question: What is the entropy of 105 molecules in 1010 boxes?
-300x200.png "CHEM134 Midterm plus Final Exam (Collection)")