Question

1. Which of the following reactions would not have an increase in entropy? CacO2 (s)CaO (s) + CO2 (B) a. b. CO2 (s) CO2 (g) 4 CaHsNsOs()6 N2 (g)+ 12 CO2 (8) +10 H2O (g) +O2 (g) c. d. O2le)+2 H2 (g)-2 H20 (g) More than one correct answer present e. How much Lithium can be produced in 50.0 Amps is applied to a molten LiBr for 43 minutes? 2. 3. What is the standard electrochemical potential for an electrochemical reaction (n=3) at 273.15 Kelvin, which has a Gibbs Energy of -480 kl/mole? At what temperature (in Celsius) doesa reaction start/stop being spontaneous if the reaction has a AH n210.5 kJ/mol and AS--128.0 J/(mol K)? 4. Which of the following would not be considered a factor for the entropy of a molecule? 5. Number of Bonds a. Mass of the element(s) b. c. Kinetic Energy d. Number of Microstates e. Bond Strength
Questions 1 - 5 s)

+ CO2 (g)

b. CO2 (s) → CO2 (g)

c. 4 C3H5N3O9(l) → 6 N2 (g) + 12 CO2 (g) +10 H2O (g) +O2 (g)

d. O2(g) + 2 H2 (g) → 2 H2O (g)

e. More than one correct answer present.

2. How much Lithium can be produced in 50.0 Amps is applied to a molten LiBr for 43 minutes?

3. What is the standard electrochemical potential for an electrochemical reaction (n=3) at 273.15

Kelvin, which has a Gibbs Energy of ‐480 kJ/mole?

4. At what temperature (in Celsius) does a reaction start/stop being spontaneous if the reaction

has a H°

rxn = ‐210.5 kJ/mol and S°= ‐128.0 J/(mol K)?

5. Which of the following would not be considered a factor for

Answer 1

Ans 1 : d)  O2(g) + 2 H2 (g) → 2 H2O (g)

Entropy is the degree of randomness or disorderness of the system. So if number of gaseous particles in a system increases , the entropy also increases. Here in this reaction mentioned in option d , the number of gaseous particles in the reaction decrease in the products side , so the entropy also decreases.