[lab123]

In the previous question, you had to calculate the the standard Free Energy Change (Go) in order to solve for the equilibrium constant, K, for the reaction:


N2(g) + 3H2(g) → 2NH3(g)


This is the Free Energy measured under standard conditions, when the reaction is started with 1.0 M of each of the three gases present. Calculate the non-standard Free Energy change (G) at 298 K, given the following non-standard initial concentrations of the three gases. Answer in kJ.
Gfo = -16.6 kJ/mol for NH3 (g) at 298 K

initial concentration (M)
N2   1.0
H2   0.01
NH3   4.5

I use the equation for K to find the equilibrium constant of Q=20049504.95

I then use the equation ΔG=ΔG°+RTln(Q)

I keep getting an answer of 41643.09479/1000=41.643...

Where am I going wrong?

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The spontaneity of a standard reaction, ΔGo, depends on both ΔHo and ΔSo. Given the following reaction and data table, decide if each of the statements shown below are True or False.
Assume that ΔHo and ΔSo are independent of Temperature.

3 O2 (g) → 2 O3 (g)

ΔHorxn   285 kJ
ΔSorxn   -137 J/K

My answers will be in blue

 This reaction is endothermic True
 This reaction is exothermic False
 This reaction is endergonic (ΔGo > 0) at 298 K True
 This reaction is exergonic (ΔGo < 0) at 298 K False
 This standard reaction will only be spontaneous at high temperatures (T > 2080 K) False
 This standard reaction will only be spontaneous at low temperatures (T < 2080 K) False
 This standard reaction will be spontaneous at all temperatures True
 This standard reaction will not be spontaneous at any temperature True

I have tried this problem several times. Could anybody maybe help me and tell me which ones I might have wrong?

[sjb]

This standard reaction will only be spontaneous at high temperatures (T > 2080 K) False
 This standard reaction will only be spontaneous at low temperatures (T < 2080 K) False
 This standard reaction will be spontaneous at all temperatures True
 This standard reaction will not be spontaneous at any temperature True

I have tried this problem several times. Could anybody maybe help me and tell me which ones I might have wrong?

For the last pair of pairs, surely only one can be right. How are you calculating spontaneity?