Question

9. (20 pts) The following reaction: $NH_4Cl(s) \rightleftharpoons NH_3(g) + HCl(g)$ I. Determine the heat of reaction ($\Delta H^\circ$). Is the reaction endothermic or exothermic? Explain. $\Delta H^\circ$ (kJ/mol) $NH_4Cl$ -314.4 $NH_3(g)$ -45.9 $HCl(g)$ -92.31 II. Predict the effect (shift right, shift left, or no effect) of the following: a. Adding more $NH_3$ to the reaction mixture: b. Decreasing the temperature of the reaction mixture: c. Adding more $NH_4Cl$ to the reaction mixture: d. Removing some $HCl$ to the reaction mixture: e. Decreasing the volume of the reaction mixture: f. Adding a catalyst to the reaction mixture: III. $\Delta S^\circ_{rx} = 284.6 J/K\cdot mol$, determine $\Delta G^\circ$ and the equilibrium constant of the reaction at 25 $^\circ C$? Is the reaction spontaneous or nonspontaneous? Explain. II. If a vessel containing solid $NH_4Cl$ is sealed at 25 $^\circ C$, what are the concentrations of $NH_3$ and $HCl$ at equilibrium?

          9. (20 pts) The following reaction:
$NH_4Cl(s) \rightleftharpoons NH_3(g) + HCl(g)$
I.
Determine the heat of reaction ($\Delta H^\circ$). Is the reaction endothermic or exothermic? Explain.
$\Delta H^\circ$ (kJ/mol)
$NH_4Cl$
-314.4
$NH_3(g)$
-45.9
$HCl(g)$
-92.31
II.
Predict the effect (shift right, shift left, or no effect) of the following:
a. Adding more $NH_3$ to the reaction mixture:
b. Decreasing the temperature of the reaction mixture:
c. Adding more $NH_4Cl$ to the reaction mixture:
d. Removing some $HCl$ to the reaction mixture:
e. Decreasing the volume of the reaction mixture:
f. Adding a catalyst to the reaction mixture:
III.
$\Delta S^\circ_{rx} = 284.6 J/K\cdot mol$, determine $\Delta G^\circ$ and the equilibrium constant of the reaction at 25 $^\circ C$? Is
the reaction spontaneous or nonspontaneous? Explain.
II. If a vessel containing solid $NH_4Cl$ is sealed at 25 $^\circ C$, what are the concentrations of $NH_3$ and $HCl$ at
equilibrium?

9. (20 pts) The following reaction:
NH4Cl(s) ⇌ NH3(g) + HCl(g)
I.
Determine the heat of reaction (Δ H^∘). Is the reaction endothermic or exothermic? Explain.
Δ H^∘ (kJ/mol)
NH4Cl
-314.4
NH3(g)
-45.9
HCl(g)
-92.31
II.
Predict the effect (shift right, shift left, or no effect) of the following:
a. Adding more NH3 to the reaction mixture:
b. Decreasing the temperature of the reaction mixture:
c. Adding more NH4Cl to the reaction mixture:
d. Removing some HCl to the reaction mixture:
e. Decreasing the volume of the reaction mixture:
f. Adding a catalyst to the reaction mixture:
III.
Δ S^∘rx = 284.6 J/K· mol, determine Δ G^∘ and the equilibrium constant of the reaction at 25 ^∘ C? Is
the reaction spontaneous or nonspontaneous? Explain.
II. If a vessel containing solid NH4Cl is sealed at 25 ^∘ C, what are the concentrations of NH3 and HCl at
equilibrium?

Added by Lauren T.

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