Gibb's free energy (very simple one)

[pari786]

Homework Statement

Calculate the equilibrium constant for the reaction forming nitric oxide at room temperature, 25C. G= 1.73x10^5 J/mol, H = 180.5KJ/mol an S = 24.8J/(mol.K)

Homework Equations

ln K = -G/RT

The Attempt at a Solution

I subsiuted ln K = (-1.73x10^5) / (8.3145x298.15)
ln K = -69.78
e^-69.78
I'm getting K as 4.95*10^-31

but the computer (where I submit online assignment ) is saying its wrong ... I've only one single attempt left ..can anyone see where I'm wrong.
Thanks and immediate help please!

 

[chemisttree]

Please show some more work. In particular, how did you obtain the value for G? What units did you use for R and S? Example: H is in KJ/mol and S is in J/molK. When I mess up these calculations, it is usually related to units.

BTW, for a very useful compilation of R in various units, consult the CRC Handbook of Chemistry and Physics. In the 84th edition (2003-2004), a very complete table is printed on page 1-54.

 

[Blueshift5]

Your attempt at solving this problem is correct. The equilibrium constant for this reaction at room temperature is indeed 4.95*10^-31. However, it is possible that the computer is expecting the answer in a different format or with a different number of significant figures. Make sure to double check the instructions and try rounding your answer to the appropriate number of significant figures. If you are still having trouble, it may be helpful to reach out to your instructor for clarification.