Using data from Appendix 4, calculate Δ H ° , Δ G ° , and K (at 298 K) for the production of ozone from oxygen: 3O 2 ( g ) ⇌ 2O 3 ( g ) a. 30 km above the surface of the earth, the temperatureis about 230. K and the partial pressure of oxygen isabout 1.0 × 10 − 3 atm. Estimate the partial pressure ofozone in equilibrium with oxygen at 30 km above theearth’s surface. Is it reasonable to assume that the equilibriumbetween oxygen and ozone is maintained underthese conditions? Explain.
Using data from Appendix 4, calculate Δ H ° , Δ G ° , and K (at 298 K) for the production of ozone from oxygen: 3O 2 ( g ) ⇌ 2O 3 ( g ) a. 30 km above the surface of the earth, the temperatureis about 230. K and the partial pressure of oxygen isabout 1.0 × 10 − 3 atm. Estimate the partial pressure ofozone in equilibrium with oxygen at 30 km above theearth’s surface. Is it reasonable to assume that the equilibriumbetween oxygen and ozone is maintained underthese conditions? Explain.
Solution Summary: The author explains that the temperature at 30 km above the earth's surface is about 230 K. The partial pressure of ozone in equilibrium with oxygen should be estimated.
Using data from Appendix 4, calculate
Δ
H
°
,
Δ
G
°
, and K(at 298 K) for the production of ozone from oxygen:
3O
2
(
g
)
⇌
2O
3
(
g
)
a. 30 km above the surface of the earth, the temperatureis about 230. K and the partial pressure of oxygen isabout
1.0
×
10
−
3
atm. Estimate the partial pressure ofozone in equilibrium with oxygen at 30 km above theearth’s surface. Is it reasonable to assume that the equilibriumbetween oxygen and ozone is maintained underthese conditions? Explain.
The standard free energy of formation of nitric oxide, NO, at 1000. K (roughly the
temperature in an automobile engine during ignition) is 77.5 kJ/mol. Calculate the
equilibrium constant for the reaction
N2(g) + O2(g) = 2NO(g)
at 1000. K.
O 1.55 x 105
O -14.6
8.00 x 10-9
0.948
8.95 x 10-5
A crucial reaction for the production of synthetic fuels is the production of H2 by reaction of coal with steam, The reaction is:
C(s) + H2O(g) ↔ CO(g) + H2(g)
Calculate the equilibrium constant for this reaction at 850°C.
Consider the Haber process at 500 ºC: N, (g) + 3H, (g)=2NH; (g) with a AH of reaction equal to
-92 kJ/mol. How would the equilibrium be influenced by each of the following changes?
• Increasing the temperature - left, right, or no effect?
• Increasing the volume – left, right, or no effect?
• Increasing the pressure
• Adding He (g) to the system – left, right, or no effect?
• Adding N2 (g) to the system - left, right, or no effect?
• Adding catalytic Pt (s) to the system – left, right, or no effect?
- left, right, or no effect?
Below is a hypothetical reaction and a table showing the initial concentrations of substances in the
reaction. If x represents the increase in the concentration of A as the reaction gets to equilibrium,
which of these expressions would you use to solve for x?
A
+
B
20
initial:
2
10
K= (10 – 2x)*/x(2+x)
= (10 + 2x)*/x(2+x)
K= (10 – 2x)*/2x
K= (10 – x)*/x(2+x)
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