Dear Dr. Uma,
I was unable to get the correct answer for this question. I tried various different ways, but still am not able to get it. Please let me know...
Thank you.

here we need a correction
8 SO2(g) --> S8(s) + 8O2(g) H = +2775 kJ/mol ;
2SO2(g) + O2(g) --> 2 SO3(g) H = -198 kJ/mol.