At 248 °C and a total pressure of 1.00 atm the degree of dissociation of SbCI.(g)
is alpha = 0.718 for the reaction
SbCI.(g) -> SbCIs(g) + Cl.(g)
The degree of dissociation alpha is defined as:
alpha = (number of moles of SbCl. dissociated at equilibrium) / (original number of
moles of SbCI.)
(a) What is the value of the equilibrium constant K(T) at 248 °C and 1.00 atm?
(b) What is the value of K, (the equilibrium constant expression expressed in terms of
mol fractions) at the same temperature when the pressure is 5.00 atm? Assume that
under these conditions the system at equilibrium behaves as an ideal gas mixture.
(c) What is the value of the degree of dissociation alpha in the conditions of part (b)?
Which one of the following statements is / are incorrect for the reaction
2 NaHCO,(s) Na.CO3(s) + H2O(g) + CO2(g)
at low pressure?
(a) K(T) = * (P(H_O)/P) * (P(CO2)/P9)/(P(NaHCOs)/P°)
(b) K, = x(H2O x(CO2) * (P/P9)2
(c) If initially there was only NaHCOs(s) present, then A,G° = -2RT In(P/(2 P°))
(d) A,G° = °(H2O + °(CO2), where °(A) is the standard chemical potential of species
(e) A,G = o in the system at the instant when only NaHCOs(s) is present in the reaction
3. The normal boiling point of diethyl ether is 34.5 °C, and its molar enthalpy of
vaporization (that may be assumed independent of the temperature for this
problem) is 26.7 kJ / mol. What is the vapor pressure of diethyl ether at 25.0
°C? Please recall that at the normal boiling point the vapor pressure of the
liquid is 760 mmHg.
4. The molar solubility S of Ag.CrO. in water at 25 °C following from the
Ag:CrO.(s) -> 2 + CrO.²(aq) is is = 8.74 x 10 mol / L. What is the
value of the solubility product equilibrium constant Kw for Ag.CrO. in water at
25 °C? Assume that the Debye-Hueckel limiting law for the activity
coefficients applies in this situation.
5. Calculate the electromotive force of the cell
Pt(s) I H2(g, 1.0 bar) I Hl(aq, 0.0070 mol / L) I Agl(s) I Ag(s)
at 25 °C. Is the cell correctly written? Assume that at the concentration considered the
Debye-Hueckel limiting law for the activity coefficients is valid.
E°( Agl(s)/Ag(s)) = -0.15224 V
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