Verified answer

To solve, use this formula:

I will represent delta with a d.

dG= dH-T (dS)

Next convert the dS of -74.9J to KJ= -0.0749KJ

Also Change temp from deg C to Kelvin=377+273.15= 650.15K

Now solve using the eqtn above.

dG= (126KJ/mol)-(650.15K)(-0.0749KJ/mol K)

K cancels

Therefore= 174.696KJ/mol= option d. thus 175KJ/mol.

Good luck