Question 1

Acetone boils at 53°C. Using Trouton's rule, estimate acetone's molar enthalpy of vaporization.

Accepted Answer

The answer of Acetone boils at 53°C. Using Trouton's rule,...

Question 2

Exhibit 13-1 The following question(s) pertain to the reaction CCl₄(l) → CCl₄(g). Refer to Exhibit 13-1. What is the value of DS°_vap?

Accepted Answer

The entropy of vaporization is positive because the gas phase is more disordered than the liquid phase. The value of DS°_vap is 93.3 J·K^-¹.

Question 3

Exhibit 13-1 The following question(s) pertain to the reaction CCl₄(l) → CCl₄(g). Refer to Exhibit 13-1. What is value of DH°_vap?

Accepted Answer

The answer of Exhibit 13-1
The following question(s) pertain to the...

Question 4

Exhibit 13-1 The following question(s) pertain to the reaction CCl₄(l) → CCl₄(g). Refer to Exhibit 13-1. What is the predicted boiling point of CCl₄?

Accepted Answer

The answer of Exhibit 13-1
The following question(s) pertain to the...

Question 5

Exhibit 13-1 The following question(s) pertain to the reaction CCl₄(l) → CCl₄(g). Refer to Exhibit 13-1. Using Trouton's rule, what is the approximate boiling point of CCl₄?

Accepted Answer

Trouton's rule states that the normal boiling point of a liquid is approximately equal to its enthalpy of vaporization divided by its entropy of vaporization. The enthalpy of vaporization of CCl₄ is 30.0 kJ/mol, and its entropy of vaporization is 85.0 J/(mol·K). Therefore, the normal boiling point of CCl₄ is approximately 30.0 kJ/mol / 85.0 J/(mol·K) = 353 K = 80°C.

Question 6

The process I₂(s) → I₂(g) is spontaneous at 25°C?

Accepted Answer

The sublimation of iodine from solid to gas is not spontaneous at 25°C because it requires an input of energy to overcome the lattice energy of the solid.

Question 7

Can the reaction C(s, graphite) → C(s, diamond) ever be spontaneous?

Accepted Answer

The answer of Can the reaction C(s, graphite) → C(s,...

Question 8

Exhibit 13-2 The following question(s) pertain to the reaction 2NO₂(g) → N₂O₄(g). Refer to Exhibit 13-2. Is this reaction spontaneous at 25°C?

Accepted Answer

The reaction is spontaneous at 25°C because the change in free energy (ΔG) is negative.

Question 9

Exhibit 13-2 The following question(s) pertain to the reaction 2NO₂(g) → N₂O₄(g). Refer to Exhibit 13-2. As temperature increases, the value of DG_rxn will?

Accepted Answer

As temperature increases, the entropy term (TΔS) in the Gibbs free energy equation (ΔG = ΔH - TΔS) becomes more significant. Since the reaction involves a decrease in the number of gas molecules, ΔS is negative, making ΔG more positive as temperature increases.

Question 10

Exhibit 13-2 The following question(s) pertain to the reaction 2NO₂(g) → N₂O₄(g). Refer to Exhibit 13-2. At what temperature will the value of DG_rxn = 0?

Accepted Answer

The temperature at which ΔG_rxn = 0 can be found using the equation ΔG = ΔH - TΔS. Solving for T when ΔG = 0 gives T = ΔH/ΔS. The given temperature of 53°C is likely the calculated temperature where this condition is met.

Question 11

Allotropic forms of an element that do not represent an element in its standard state will have

Accepted Answer

Allotropic forms of an element that are not in their standard state will have non-zero values for both $\Delta \mathrm{H}_{f}^{\circ}$ and $\Delta \mathrm{G}_{f}^{\circ}$. The standard state of an element has $\Delta \mathrm{H}_{f}^{\circ}$ and $\Delta \mathrm{G}_{f}^{\circ}$ equal to zero.

Question 12

A solid of mass m initially at T₀ is heated to T₁ at constant pressure where it proceeds to melt. Once all of the solid is in the liquid phase it is further heated to T₂. If the solid and liquid have specific heat capacities of c $\mathrm{}_{\mathrm{p}}^{sol}$ and c $\mathrm{}_{\mathrm{p}}^{liq}$ respectively, which equation below best represents the change in entropy for this system?

Accepted Answer

The answer of A solid of mass m initially at...

Question 13

The constant that connects the entropy of a system to the number of microstates is

Accepted Answer

The constant that connects the entropy of a system to the number of microstates is Boltzmann's constant, k_B, which is equal to R/N_A.

Quiz 13: Spontaneous Processes and Thermodynamic Equilibrium

Acetone boils at 53°C. Using Trouton's rule, estimate acetone's molar enthalpy of vaporization.

Exhibit 13-1 The following question(s) pertain to the reaction CCl₄(l) → CCl₄(g) . Refer to Exhibit 13-1. What is the value of DS°_vap?

Exhibit 13-1 The following question(s) pertain to the reaction CCl₄(l) → CCl₄(g) . Refer to Exhibit 13-1. What is value of DH°_vap?

Exhibit 13-1 The following question(s) pertain to the reaction CCl₄(l) → CCl₄(g) . Refer to Exhibit 13-1. What is the predicted boiling point of CCl₄?

Exhibit 13-1 The following question(s) pertain to the reaction CCl₄(l) → CCl₄(g) . Refer to Exhibit 13-1. Using Trouton's rule, what is the approximate boiling point of CCl₄?

The process I₂(s) → I₂(g) is spontaneous at 25°C?

Can the reaction C(s, graphite) → C(s, diamond) ever be spontaneous?

Exhibit 13-2 The following question(s) pertain to the reaction 2NO₂(g) → N₂O₄(g). Refer to Exhibit 13-2. Is this reaction spontaneous at 25°C?

Exhibit 13-2 The following question(s) pertain to the reaction 2NO₂(g) → N₂O₄(g) . Refer to Exhibit 13-2. As temperature increases, the value of DG_rxn will?

Exhibit 13-2 The following question(s) pertain to the reaction 2NO₂(g) → N₂O₄(g) . Refer to Exhibit 13-2. At what temperature will the value of DG_rxn = 0?

Allotropic forms of an element that do not represent an element in its standard state will have

The constant that connects the entropy of a system to the number of microstates is

Quiz 13: Spontaneous Processes and Thermodynamic Equilibrium

Acetone boils at 53°C. Using Trouton's rule, estimate acetone's molar enthalpy of vaporization.

Exhibit 13-1 The following question(s) pertain to the reaction CCl4(l) → CCl4(g) . Refer to Exhibit 13-1. What is the value of DS°vap?

Exhibit 13-1 The following question(s) pertain to the reaction CCl4(l) → CCl4(g) . Refer to Exhibit 13-1. What is value of DH°vap?

Exhibit 13-1 The following question(s) pertain to the reaction CCl4(l) → CCl4(g) . Refer to Exhibit 13-1. What is the predicted boiling point of CCl4?

Exhibit 13-1 The following question(s) pertain to the reaction CCl4(l) → CCl4(g) . Refer to Exhibit 13-1. Using Trouton's rule, what is the approximate boiling point of CCl4?

The process I2(s) → I2(g) is spontaneous at 25°C?

Can the reaction C(s, graphite) → C(s, diamond) ever be spontaneous?

Exhibit 13-2 The following question(s) pertain to the reaction 2NO2(g) → N2O4(g). Refer to Exhibit 13-2. Is this reaction spontaneous at 25°C?

Exhibit 13-2 The following question(s) pertain to the reaction 2NO2(g) → N2O4(g) . Refer to Exhibit 13-2. As temperature increases, the value of DGrxn will?

Exhibit 13-2 The following question(s) pertain to the reaction 2NO2(g) → N2O4(g) . Refer to Exhibit 13-2. At what temperature will the value of DGrxn = 0?

Allotropic forms of an element that do not represent an element in its standard state will have

The constant that connects the entropy of a system to the number of microstates is

Exhibit 13-1 The following question(s) pertain to the reaction CCl₄(l) → CCl₄(g) . Refer to Exhibit 13-1. What is the value of DS°_vap?

Exhibit 13-1 The following question(s) pertain to the reaction CCl₄(l) → CCl₄(g) . Refer to Exhibit 13-1. What is value of DH°_vap?

Exhibit 13-1 The following question(s) pertain to the reaction CCl₄(l) → CCl₄(g) . Refer to Exhibit 13-1. What is the predicted boiling point of CCl₄?

Exhibit 13-1 The following question(s) pertain to the reaction CCl₄(l) → CCl₄(g) . Refer to Exhibit 13-1. Using Trouton's rule, what is the approximate boiling point of CCl₄?

The process I₂(s) → I₂(g) is spontaneous at 25°C?

Exhibit 13-2 The following question(s) pertain to the reaction 2NO₂(g) → N₂O₄(g). Refer to Exhibit 13-2. Is this reaction spontaneous at 25°C?

Exhibit 13-2 The following question(s) pertain to the reaction 2NO₂(g) → N₂O₄(g) . Refer to Exhibit 13-2. As temperature increases, the value of DG_rxn will?

Exhibit 13-2 The following question(s) pertain to the reaction 2NO₂(g) → N₂O₄(g) . Refer to Exhibit 13-2. At what temperature will the value of DG_rxn = 0?