Styrene is produced by catalytic dehydrogenation of ethyl- benzene at high temperature in the presence of superheated steam.

Question

Given the following data,

Ethylbenzene, C6H5--CH2CH3 :

delta Ht = -12.5 kJ/mol,

delta Gt = 119.7 kJ/mol and

S = 255 J/mol*K

Styrene, C6H5--CH==CH2 :

delta Ht = 103.8 kJ/mol,

delta Gt = 202.5 kJ/mol

and S = 238 J/mol*K

(a) Find ÄH°rxn, ÄG °rxn, and ÄS °rxn, given these data at 298 K: answer 116.3 kj, 82.8 kj, 114 j/k

(b) At what temperature is the reaction spontaneous? answer 747C

C)What are Delta G (answer 16.8 kj/m )

and K at 600 degrees?

Note: I only need help with K at 600 degrees. Thank you.

I thought it was 9.9 x 10^2 but it was marked wrong

Answer 1

I get 0.0988. I think you dropped the - sign AND you are allowed more than two significant figures in the answer.