2NH3(g) + 3O2(g) + 2CH4(g) 2HCN(g) + 6H2O(g) |
?H°f (kJ mol-1) | S° (J K-1 mol-1) | |
NH3(g) | -46 | 193 |
O2(g) | 0 | 205 |
CH4(g) | -75 | 186 |
HCN(g) | 135.1 | 202 |
H2O(g) | -242 | 189 |
The above reaction is used in the industrial production of hydrogen cyanide. (The tabulated values ?H°fand S° are for 25°C. For the purposes of this question assume that ?H° and ?S° are invariant with temperature. This is not actually true but would generally be a reasonable approximation over "small" temperature ranges.)
?H° is -939.8
?S° is 165
Calculate ?G° at 1005°C, for this equation.
Are the following statements about this process True or False?
At temperatures significantly lower than 1000°C this reaction is
spontaneous.
The high temperature required for this process is needed for
thermodynamic reasons.
The equilibrium position for this reaction is further to the right
at higher temperatures.
Thermodynamically, this reaction is spontaneous only below a
certain temperature.
This reaction is endothermic at room temperature.
Go = Ho - T So
Go = -939.8 - 1278*165
Go= - 211.8 KJ
1) True ------------- Spontaneous, due to Go is negative.
2) True -------------At higher temperature Go is negative, so it is a spontaneous reaction at higher temperatures.
3) True -------------- At higher temperatures this reaction is spontaneous, so the equilibrium shifts towards the right.
4) False ------------- At above certain temperatures the reaction is spontaneous, due to negative Go value.
5) False -------------- At room temperature, the reaction is spontaneous, so no need for higher temperature.
2NH3(g) + 3O2(g) +2CH4(g) 2HCN(g) +6H2O(g)?H°f (kJ mol-1)S° (J K-1 mol-1)NH3(g)...
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AHºf (kJ/mol) AG°f (kJ/mol) Sº (J/mol K) 0 0 130.7 Hydrogen H2 (g) H (g) H' (g) H+ (aq) 218.0 203.2 114.7 1536.2 0 -230.0 -157.0 -11.0 -285.8 -237.1 69.9 OH(aq) H20 (1) H20 (g) H2O2 (1) -241.8 -228.6 188.8 -187.8 -120.4 109.6 Iodine AH.(kJ/mol). | AGO. (k.I/mol) go (I/mol K | -53.0 -13.0 242.0 -277.7 -174.8 160.7 282.7 -235.1 -484.0 160.0 C2H40 (g, ethylene oxide) CH3CH2OH (1) CH3CH2OH (g) CH3COOH (1) C2H6 (g) C3H6 (g) CzH; (g) CH2=CHCN (1)...